What if the Pratt Libraries don't have what you need?
Thankfully, you still have options!
If you can wait to see the item, you can request to have the material sent to you through ConnectNY, a consortium of 17 libraries that will send the book to the library within a week. You can also use ILL (Inter-Library Loan) to request articles, chapters and books, but which can take 1-2 weeks for books, less for scans of articles.
Or you can suggest that the library purchase the item you need. However if purchased, it generally takes a month for the item 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 NYC 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.