http://tags.library.upenn.edu/project/28571 PennTags Feed http://tags.library.upenn.edu/makerecord/project/28571 http://tags.library.upenn.edu/makerecord/project/28571 http://tags.library.upenn.edu/makerecord/ered/28572 http://tags.library.upenn.edu/makerecord/ered/28572 <div class="mlacite">Use this database to search for the location of unpublished primary sources material. Very impressive coverage for collections in the United States.</div> http://tags.library.upenn.edu/makerecord/ered/28573 http://tags.library.upenn.edu/makerecord/ered/28573 <div class="mlacite">Enormous catalog of books, manuscripts and other materials held by libraries around the world, although the best coverage is for the United States.</div>