Choose the Books tab from the Hunter Libraries homepage. To limit to print, choose Items Currently on Shelf under Limit to in the right panel. To search all of CUNY choose CUNY from the drop-down to right of the search box. To request books from other CUNY libraries click on Sign In with CUNY Login to see available request options.
Google Books gives you access to the searchable full text of millions of out of copyright texts, including the vast majority of classic philosophy texts. Books still in copyright (roughly those published since 1923) are often partially available in Google Books.
For books not owned by CUNY try World Cat. World Cat will give you access to the catalogs of hundreds of college, university, and research libraries. You can then request these books on interlibrary loan.