**Note**: In order of [Library of Congress Classification](http://www.loc.gov/catdir/cpso/lcco/) # [(B)](https://www.loc.gov/aba/cataloging/classification/lcco/lcco_b.pdf) PHILOSOPHY, PSYCHOLOGY, RELIGION ## (BF) Psychology * [Computational Cognitive Neuroscience](https://github.com/CompCogNeuro/ed4) - Randall C. O’Reilly Yuko Munakata Michael J. Frank Thomas E. Hazy * [ePsych](https://epsych.msstate.edu) - Gary L. Bradshaw * [Neural Networks - A Systematic Introduction](http://page.mi.fu-berlin.de/rojas/neural/) - Raul Rojas * [Neuronal Dynamics: From single neurons to networks and models of cognition](https://neuronaldynamics.epfl.ch) - Wulfram Gerstner, Werner M. Kistler, Richard Naud and Liam Paninski * [Neuroscience](https://www.bna.org.uk/static/uploads/resources/BNA_English.pdf) - British Neuroscience Association European Dana Alliance for the Brain (PDF) * [Neuroscience Online](https://nba.uth.tmc.edu/neuroscience/) - John H. Byrne * [Probabilistic Models of Cognition](https://probmods.org) - Noah D. Goodman et al. * [Psychology: An Introduction](https://www.psywww.com/intropsych) - Russell A. Dewey * [Spiking Neuron Models Single Neurons, Populations, Plasticity](https://lcnwww.epfl.ch/gerstner/SPNM/) - Wulfram Gerstner and Werner M. Kistler * [The Brain Facts Book](https://www.brainfacts.org/The-Brain-Facts-Book) # [(Q)](https://www.loc.gov/aba/cataloging/classification/lcco/lcco_q.pdf) Science (General) ## (QA) Mathematics * [A First Course in Linear Algebra](http://linear.ups.edu) - Robert A. Beezer * [Advanced Algebra](http://www.math.stonybrook.edu/~aknapp/download/a2-alg-inside.pdf) - Anthony W. Knapp (PDF) * [Advanced Calculus](http://www.oercommons.org/courses/advanced-calculus/view) - Lynn H. Loomis and Shlomost Ernberg (PDF) * [An Introduction to Mathematical Reasoning](http://www.maths.manchester.ac.uk/~nige/IMRpartI.pdf) - Peter J. Eccles (PDF) * [An Introduction to the Theory of Numbers](http://www.trillia.com/moser-number.html) - Leo Moser (PDF) * [Basic Algebra](http://www.math.stonybrook.edu/~aknapp/download/b2-alg-inside.pdf) - Anthony W. Knapp (PDF) * [Basic Concepts of Mathematics](http://www.trillia.com/dA/zakon-basic-a4-one.pdf) - Elias Zakon (PDF) * [Basics of Algebra, Topology, and Differential Calculus](http://www.cis.upenn.edu/~jean/math-basics.pdf) (PDF) * [Book Of Proof (2013)](http://www.people.vcu.edu/~rhammack/BookOfProof) - Richard Hammack * [Calculus](https://ocw.mit.edu/ans7870/resources/Strang/Edited/Calculus/Calculus.pdf) - Gilbert Strang (PDF) * [Calculus Better Explained](https://betterexplained.com/calculus/) - Kalid Azad (online) * [Calculus Made Easy](http://www.gutenberg.org/ebooks/33283) - Silvanus P. Thompson (PDF) * [College Geometry](http://math.unideb.hu/media/vincze-csaba/collegegeom-main-1.pdf) - Csaba Vincze and László Kozma (PDF) * [Computational Geometry](http://web.mit.edu/hyperbook/Patrikalakis-Maekawa-Cho/) * [Elementary Algebra (2011)](http://www.mathhands.com/046) - Francisco Javier Márquez * [Elementary Differential Equations](http://ramanujan.math.trinity.edu/wtrench/texts/TRENCH_DIFF_EQNS_I.PDF) - William F. Trench (PDF) * [Encyclopedia of Mathematics](https://www.encyclopediaofmath.org/index.php/Special:AllPages) - Springe * [Graph Theory](http://compalg.inf.elte.hu/~tony/Oktatas/TDK/FINAL/) * [Introduction to Probability](http://www.dartmouth.edu/~chance/teaching_aids/books_articles/probability_book/book.html) - Charles M. Grinstead and J. Laurie Snell * [Introduction to Probability and Statistics Spring 2014](http://ocw.mit.edu/courses/mathematics/18-05-introduction-to-probability-and-statistics-spring-2014/) * [Introduction to Proofs](http://joshua.smcvt.edu/proofs/) - Jim Hefferon * [Introduction to Statistical Thought](http://people.math.umass.edu/~lavine/Book/book.html) - Michael Lavine * [Lecture Notes of Linear Algebra](http://home.iitk.ac.in/~psraj/mth102/lecture_notes.html) - Dr. P. Shunmugaraj, IIT Kanpur (PDF) * [Linear Algebra](http://home.iitk.ac.in/~arlal/book/nptel/pdf/booklinear.html) - Dr. Arbind K Lal, IIT Kanpur (PDF) * [Linear Algebra](https://www.math.ucdavis.edu/~linear/linear-guest.pdf) (PDF) * [Linear Algebra by Jim Hefferon](http://joshua.smcvt.edu/linearalgebra) - Jim Hefferon * [Linear Algebra Notes](http://scipp.ucsc.edu/~haber/ph116A/new_linearalgebra.pdf) - David A. Santos (PDF) * [Mathematical Logic - an Introduction](http://www.ii.uib.no/~michal/und/i227/book/book.pdf) (PDF) * [Mathematics For Computer Science (2017)](https://courses.csail.mit.edu/6.042/spring17/mcs.pdf) - Eric Lehman et al. (PDF) * [Mathematics for Physics](http://www.goldbart.gatech.edu/PostScript/MS_PG_book/bookmaster.pdf) - Michael Stone and Paul Goldbart (PDF) * [Mathematics Formulary](https://johanw.home.xs4all.nl/math.pdf) - J.C.A. Wevers (PDF) * [Modern Elementary Geometry](https://digital.lib.washington.edu/researchworks/bitstream/handle/1773/15592/Lectures_of_polygons_%20BG_1997.pdf?sequence=1) - B. Grünbaum (PDF) * [Number Theory](https://github.com/holdenlee/number-theory) - Holden Lee MIT * [OpenIntro Statistics](https://www.openintro.org/stat/textbook.php) * [OpenStax - Mathematics](https://openstax.org/subjects/math) - OpenStax (PDF) * [Ordinary Differential Equations](https://en.wikibooks.org/wiki/Ordinary_Differential_Equations) - Wikibooks * [Probability and Statistics Cookbook](http://statistics.zone) * [Probability and Statistics EBook](http://wiki.stat.ucla.edu/socr/index.php/Probability_and_statistics_EBook) * [Stacks Project](http://stacks.math.columbia.edu) * [Statistics Done Wrong](http://www.statisticsdonewrong.com) - Alex Reinhart * [The Handbook of Essential Mathematics ](https://florida.theorangegrove.org/og/file/3a8c652c-11d0-e967-95fb-b5bbae2586d6/1/math_handbook.pdf) - John C. Sparks (PDF) * [Trigonometry Lecture Notes And Exercises](http://pages.uoregon.edu/raies/Teaching%20Documents/Math%20112%20-%20Spring%202014/Lecture_Notes.pdf) - D. Raies (PDF) * [Understanding Basic Calculus](http://www.math.nagoya-u.ac.jp/~richard/teaching/f2015/BasicCalculus.pdf) - S.K. Chung (PDF) ## (QB) Astronomy * [A Short History of Astronomy (1898)](https://ia601408.us.archive.org/16/items/shorthistoryofas025511mbp/shorthistoryofas025511mbp.pdf) - Arthur Berry (PDF) * [Archaeology, Anthropology, and Interstellar Communication (2014)](https://unglue.it/work/139785/) - Douglas A. Vakoch * [Astronomy (1877)](https://unglue.it/work/81942/) - Sir Robert Stawell Ball * [Astronomy (1915)](https://unglue.it/work/81943/) - Harold Jacoby * [Astronomy (OpenStax)](https://openstax.org/details/books/astronomy) - Andrew Fraknoi et al. (PDF) * [Elements of astronomy (1836)](https://unglue.it/work/81958/) - John Hubbard Wilkins * [Hubble 25: A Quarter-Century of Discovery with the Hubble Space Telescope (2015)](https://unglue.it/work/145858/) - Dylan Steele ## (QC) Physics * [A Text Book for High School Students Studying Physics](http://ftp.igh.cnrs.fr/pub/nongnu//fhsst/Physics_Grade_10-12.pdf) - FHSST Authors (PDF) * [An introduction to Physics](http://eacpe.org/content/uploads/2014/01/PHYSICS-101.pdf) - Pervez Hoodbhoy (PDF) * [Atomic and Molecular Physics - Lecture Notes](http://www.yorku.ca/tomk/PHYS4011-W13.pdf) - Tom Kirchner (PDF) * [Classical Dynamics](http://www.damtp.cam.ac.uk/user/tong/dynamics/clas.pdf) - David Tong (PDF) * [Classical Mechanics](http://www.physics.rutgers.edu/ugrad/494/bookr03D.pdf) - Joel A. Shapiro (PDF) * [Dynamics and Relativity](http://www.damtp.cam.ac.uk/user/tong/relativity/dynrel.pdf) - David Tong (PDF) * [Fluid Dynamics - Lecture Notes](https://www.iare.ac.in/sites/default/files/FD_IARE_LECTURE%20_NOTES.pdf) - Shiva Prasad (PDF) * [Fundamental Physics for Level 0 - Teaching Guide](https://oup.com.pk/media/teaching-guides/Fundamental%20Biology%20Physics%20Chemistry/Fundamental%20Physics%20for%20O%20Level%20Teaching%20Guide.pdf) - Ian Collins (PDF) * [Fusion Physics](https://www-pub.iaea.org/MTCD/Publications/PDF/Pub1562_web.pdf) - (PDF) * [GRE Physics Test Practice Book](https://www.ets.org/s/gre/pdf/practice_book_physics.pdf) - (PDF) * [Introduction to General Relativity](http://www.staff.science.uu.nl/~hooft101/lectures/genrel_2013.pdf) - Gerard ’t Hooft (PDF) * [Introductory Physics I - Elementary Mechanics](https://webhome.phy.duke.edu/~rgb/Class/intro_physics_1/intro_physics_1.pdf) - R.G. Brown (PDF) * [Lecture Notes in Quantum Mechanics](https://physics.bgu.ac.il/~dcohen/ARCHIVE/qmc.pdf) - Doron Cohen (PDF) * [Lecture Notes on General Relativity](https://home.uni-leipzig.de/~tet/wp-content/uploads/2014/04/GR2015_0903.pdf) - Hollands and Sanders (PDF) * [Mathematical Methods in Physics - Course Notes](https://www.pa.ucla.edu/faculty-websites/dhoker-lecture-notes/graduate-courses/231A-lecture-notes-15.pdf) - Eric D’Hoker (PDF) * [Motion Mountain Physics](http://www.motionmountain.net) - Christoph Schiller * [Physics Before and After Einstein](http://www.dmi.unipg.it/mamone/pubb/PBAE.pdf) - Marco Mamone Capria (PDF) * [Physics Test Practice Book](https://www.physics.ohio-state.edu/undergrad/greStuff/exam_GR9677.pdf) - (PDF) * [Problems in Introductory Physics](http://www.lightandmatter.com/problems/problems.pdf) - B. Crowell and B. Shotwell (PDF) * [Statistical Physics](http://www.damtp.cam.ac.uk/user/tong/statphys/sp.pdf) - David Tong (PDF) * [Structure and Interpretation of Classical Mechancics](https://mitpress.mit.edu/sites/default/files/titles/content/sicm_edition_2/book.html) - Gerald Jay Sussman and Jack Wisdom * [The Feynman Lectures on Physics](http://feynmanlectures.caltech.edu) - Richard P. Feynmann * [The Physics Hypertextbook](https://physics.info) * [University Physics, Volume 1](https://openstax.org/details/books/university-physics-volume-1) - William Moebs, Samuel J. Ling, Jeff Sanny et al. (PDF) * [University Physics, Volume 2](https://openstax.org/details/books/university-physics-volume-2) - William Moebs, Samuel J. Ling, Jeff Sanny et al. (PDF) * [University Physics, Volume 3](https://openstax.org/details/books/university-physics-volume-3) - William Moebs, Samuel J. Ling, Jeff Sanny et al. (PDF) ## (QD) Chemistry * [A Dictionary of Chemistry (1777)](https://unglue.it/work/140195/) - Pierre Joseph Macquer and James Keir * [Biochemistry from a phenomenological point of view](http://www.louisbolk.org/downloads/1282.pdf) - Christa van Tellingen (PDF) * [Biochemistry Practice Book](http://www.ets.org/s/gre/pdf/practice_book_biochem.pdf) - (PDF) * [CK-12 Chemistry - Second Edition (2011)](https://unglue.it/work/140345/) - Sharon Bewick et al. * [From Vitamins to Baked Goods: Real Applications of Organic Chemistry (2012)](https://unglue.it/work/145870/) - Kieran Gallagher and Lizhi Fan * [Introduction to Chemistry](https://unglue.it/download_ebook/54777/) - Tracy Poulsen (PDF) ## (QE) Geology * [An Introduction to Geology](http://opengeology.org/textbook/) - Chris Johnson, Matt Affolter, Paul Inkenbrandt, Cam Mosher * [Physical Geology](https://opentextbc.ca/geology/open/download?type=pdf) - Steven Earle (PDF) ## (QH) Natural history ## (QK) Botany * [Beginners' Botany (1921)](http://ia801405.us.archive.org/5/items/beginners21west00bailuoft/beginners21west00bailuoft.pdf) - L.H. Bailey (PDF) ## (QL) Zoology ##* (QM) Human anatomy ## (QP) Physiology ## (QR) Microbiology # [(R)](http://www.loc.gov/aba/cataloging/classification/lcco/lcco_r.pdf) Medicine # [(T)](http://www.loc.gov/aba/cataloging/classification/lcco/lcco_t.pdf) Technology ## (TJ) Mechanical engineering and machinery (includes Energy Conservation) * [Climate Change and the Oil Industry (2003)](https://unglue.it/work/138838/) - Jon Birger Skjaerseth and Tora Skodvin * [Our Car as Power Plant (2014)](https://unglue.it/work/129373/) - Ad van Wijk and Leendert Verhoef * [Sustainable Energy - without the hot air (2009)](https://unglue.it/work/140777/) - David J. C. MacKay * [Understanding the Global Energy Crisis (2014)](https://unglue.it/work/136212/) - Eugene D. Coyle and Richard A. Simmons