Over one thousand books and tens of thousands of essays and articles.
See the online catalogs for  Pragmatism, Dewey, and American Philosophy

Nearly all of the books, and many other publications, by
other important pragmatists, including:
George H. Mead
F. C. S. Schiller
A. W. Moore
John E. Boodin
H. Heath Bawden
Charles Morris
C. I. Lewis
W. V. Quine
Hilary Putnam
Richard Rorty
Joseph Margolis
Paul Kurtz

A nearly exhaustive collection of writings about pragmatism before 1940,
as listed by Pragmatism: An Annotated Bibliography, 1898-1940

An immense (and growing!) collection of post-WW II writings about pragmatism

Several collections of manuscript materials including:
Lectures notes from courses by John Dewey and George Mead
Addison Webster Moore Papers
H. Heath Bawden Papers

Journals:
Transactions of the Charles S. Peirce Society
Journal of Speculative Philosophy
Society for the Advancement of American Philosophy Newsletter
The Personalist Forum
Overheard in Seville: Bulletin of the Santayana Society
Streams of William James
Peirce Edition Project Newsletter
Contemporary Pragmatism

And works by and about other major American philosophers such as
Jonathan Edwards
Ralph Waldo Emerson
Josiah Royce
George Santayana
The American Neo-Realists
The American Critical Realists
Alfred North Whitehead 

Research Resources and Archive Facilities

Bibliographies and databases to locate materials efficiently

Desk workspaces and computing facilities, with access to 
internet, laser printer, photocopier, phone, and fax