Accompanied by a general index to the Proceedings ... volumes 1-50, 1838-1911. Philadelphia, The American philosophical society, 1912. 2 p.l., 83 p. 24 1/2 cm. Register of papers published in v. 1-20, 1838-83, is included in "Register of papers published in the Transactions and Proceedings, Comp. by Henry Phillips, jr., 1881" : subject of register of papers published in v. 1-25, 1838-88, in "Subject-register of papers published in the Transactions and Proceedings. Comp. by Henry Phillips, jr., 1889."