@book{bhlitem57101, title = {The migration of birds }, copyright = {NOT_IN_COPYRIGHT}, url = {https://www.biodiversitylibrary.org/item/57101}, note = {https://www.biodiversitylibrary.org/bibliography/17718}, publisher = {Cambridge, University Press, 1912}, author = {Coward, T. A. (Thomas Alfred),}, year = {}, pages = {164}, keywords = {Birds|Migration|}, }