For e-books, go directly to eBook Central to get the most results using full-text searching. Use filtering options on the left of the search results or use Advance Search to narrow down your search using both the Title field and the Keyword field.
From the Web
Bookshelf - NCBI
Bookshelf provides free online access to books and documents in life science and healthcare. Search, read, and discover.
NASA e-Book Archive
Contains free e-Books from NASA, including titles such as "Dressing for Altitude, U.S. Aviation Pressure Suits."
If you need specific books ordered for your project, let a librarian know ASAP!
But before you request books, please view a preview through Google Books
to make sure that the books you are requesting would be useful for your research.