@book{bhlitem18492, title = {Memoirs of the National Academy of Sciences }, volume = {v.15 (1921)}, copyright = {Public domain. The BHL considers that this work is no longer under copyright protection.}, url = {https://www.biodiversitylibrary.org/item/18492}, note = {https://www.biodiversitylibrary.org/bibliography/7008}, publisher = {Washington, D. C, Government Printing Office, 1866-}, author = {National Academy of Sciences (U.S.)}, year = {1921}, pages = {938}, }