Most of our e-books are in the UCSD's UC Library Search and you can find them by limiting results to Online only and Resource Types books.
Once you're in the e-book collection itself, you can browse by title or search the full-text of the entire collection.
In most collections, you can print/save desired chapters as PDF files. In other collections, you may have limited ability to save or print pages.
If we don't have an e-book you need, email Deborah and I'll see what I can buy for campus, You may also check Circuit for area San Diego libraries including SDSU, USD and public libraries or to get a print copy. Circuit service has resumed to UCSD as of June 2022; you may also use your SDPL or SDCL library card to get books delivered from area Circuit libraries to the branch library closest to UCSD or your house/apartment.
Search the full text of books scanned by Google, drawn from major libraries. The number of pages you can actually view varies, from the entire book for out-of-copyright titles, to snippets or selected pages for books still in copyright. If you find a book you want, use the library catalogs at UCSD and beyond to locate a copy.
These are the main e-book collections (not single titles) of interest to math & stats researchers. Unless otherwise specified, books in these collections are also in the library catalog though the most recently published ones are generally available online 1-2 months before appearing in UC Library Search.