A Comprehensive Introduction to Differential Geometry, Vol. 5, 3rd Edition by Michael Spivak
English | Jan 1, 1999 | ISBN: 0914098748 | 475 Pages | PDF | 9 MB
What can one say about Spivak's books on differential geometry. I used a complete set in my undergrad years and used them so much that I wanted a new copy! Definitely one set of books worth having in every mathematician's library.