The Sojourner Truth Library uses the Library of Congress Classification System for the call numbers it assigns to most of the items in its collections.
Here is a general listing of call number areas for Psychology:
Search the New Paltz Catalog or New Paltz Worldcat to find books
Recent additons to the library collection
New Paltz Catalog - Subject searching
It's most efficient to look for words in the SUBJECT of a book vs. a keyword search. Use the "Words in Subject" or "Subject begins with" menu choices in the catalog.
For example, a “Subject begins with…” search will give you a list of subject headings to browse. These subject headings will be subdivided in several ways. Select one of the subject headings to view the list of books.