Book excerpt: This comprehensive catalogue provides detailed information about the holdings of the American Philosophical Society Library, one of the oldest and most prestigious research libraries in America. With its extensive collections in philosophy, science, and history, the library is an invaluable resource for scholars and researchers in many fields. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.