TY - BOOK TI - Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge VL - v. 57 (1918) UR - https://www.biodiversitylibrary.org/item/31632 PB - American Philosophical Society CY - Philadelphia PY - 1918 SN - 0003-049X N1 - Some issues lack distinctive title. --- Description based on: Vol. 119, no. 6 (Dec. 5, 1975). --- Chemical abstracts | 0009-2258 --- Issued irregularly in parts which, in v. 1-54 are numbered consecutively no. 1-220; in later vols. the consecutive numbering was discontinued. AU - American Philosophical Society. KW - Learned institutions and societies KW - Pennsylvania KW - Periodicals KW - Philadelphia KW - Science ER -