What if the Pratt Libraries don't have what you need?
Thankfully, you still have options!
If you have time to wait, you can request the material through ILL (Inter-Library Loan), which can take 1-2 weeks, usually less for articles.
Or you can suggest that the library purchase the item you need. If the librarian buys the item, it generally takes a month to become available.
If you're in a hurry, you can find the item at another NYC area library.
Use Worldcat, a catalogue that combines the catalogues of hundreds of libraries to see where else in New York the material might be located.
Pratt Libraries is part of ALB Consortium (Academic Libraries of Booklyn), so you can get an ALB card and check out 2 books from participating institutions.
A Librarian can write you a METRO PASS to visit a library you don't have access to. You won't be able to check out the item, but you can copy or scan what you need.
ALB Cards and METRO Pass information are available at the Reference Desk on the first floor of the Brooklyn Library.