diff --git a/books/free-programming-books.md b/books/free-programming-books.md
index 4b4c8d96d..b42f2e646 100644
--- a/books/free-programming-books.md
+++ b/books/free-programming-books.md
@@ -1469,6 +1469,7 @@ Kerridge (PDF) (email address *requested*, not required)
 * [Modern Fortran Tutorial](https://masuday.github.io/fortran_tutorial/) - Yutaka Masuda (HTML)
 * [Professional Programmer’s Guide to Fortran77 (2005)](https://www.star.le.ac.uk/~cgp/prof77.pdf) - Clive G. Page (PDF)
 * [Self Study Guide 2: Programming in Fortran 95](http://www.mrao.cam.ac.uk/~rachael/compphys/SelfStudyF95.pdf) - Dr Rachael Padman (PDF)
+* [User Notes On Fortran Programming (UNFP): An open cooperative practical guide (1998)](https://www.ibiblio.org/pub/languages/fortran/) (HTML)
 
 
 ### FreeBSD