Online Catalog of Open Access Textbooks

Greetings,
I came across a neat catalog of free online textbooks (thanks Jason!) and this is a relatively new area of online access:
https://open.umn.edu/opentextbooks/BookDetail.aspx?bookId=15

If you're looking for an online textbook that doesn't cost a packet, this is definitely worth checking out.  It's one way to get some background on a subject area.  Until next time, catch me in the library.