diff --git a/free-science-books.md b/free-science-books.md
index 46eb4bb..34607e0 100644
--- a/free-science-books.md
+++ b/free-science-books.md
@@ -16,3 +16,8 @@
 # Medicine [(R)](http://www.loc.gov/aba/cataloging/classification/lcco/lcco_r.pdf)
 
 # Technology [(T)](http://www.loc.gov/aba/cataloging/classification/lcco/lcco_t.pdf)
+## Mechanical engineering and machinery (TJ) (includes Energy Conservation)
+* [Climate Change and the Oil Industry](https://unglue.it/work/138838/), by Jon Birger Skjaerseth and Tora Skodvin.
+* [Our Car as Power Plant](https://unglue.it/work/129373/), by Ad van Wijk and Leendert Verhoef. 
+* [Sustainable Energy - without the hot air](https://unglue.it/work/140777/), by David J. C. MacKay.
+* [Understanding the Global Energy Crisis](https://unglue.it/work/136212/), by Eugene D. Coyle and Richard A. Simmons.