Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge. American Philosophical Society. text Philadelphia : The Society eng v. : 23-29 cm. Some issues lack distinctive title. Description based on: Vol. 119, no. 6 (Dec. 5, 1975). Issued irregularly in parts which, in v. 1-54 are numbered consecutively no. 1-220; in later vols. the consecutive numbering was discontinued. Vols. 1 (1838)-50 (1911). 1 v.; Vols. 51 (1912)-75 (1935). 1 v.; Vols. 76 (1936)-100 (1956). 1 v. Chemical abstracts Science -- Periodicals. Philadelphia (Pa.) -- Learned institutions and societies. Also issued on microfilm. Also issued online. Proceedings of the American Philosophical Society Proceedings of the American Philosophical Society (Online)