You can also enter "International Bible Students" in teh search field under 'Author'. You'll like what you'll find!
Library of Congress & the Watchtower publications...
Contrary to a somewhat common belief, the Library of Congress does not have a copy of everything that is or has been published or copyrighted in the United States.
One item they do keep in their collection that is of particular interest is the 1934 Yearbook, which contains not only the notorious "Declaration of Facts", but also a few other arguably anti-Semitic comments.