The University of Michigan Tibetan Collection

"The Tibetan Collection at the University of Michigan holds approximately 3000 volumes of Tibetan language materials containing more than twice as many titles. These include xylographs in traditional pecha format, bound codices, manuscripts and over 1500 titles on microfiche. The majority of these books were distributed by the Library of Congress as part of the PL480 program and often reproduce rare and important Tibetan works that have since been lost within Tibet itself. Most of these materials were published in South Asia through the 1960s and 70s in very limited numbers and are now out of print"

http://www.lib.umich.edu/area/sasia/Tibet/Tibetan_collection_web/general_info.htm