@book{bhlitem49545, title = {Supplement to the birds of Essex County, Massachusetts }, copyright = {Public domain. The BHL considers that this work is no longer under copyright protection.}, url = {https://www.biodiversitylibrary.org/item/49545}, note = {https://www.biodiversitylibrary.org/bibliography/14162}, publisher = {Cambridge, Mass, The Club, 1920}, author = {Townsend, Charles Wendell, and Townsend, Charles Wendell,}, year = {}, pages = {210}, keywords = {Birds|Essex County|Massachusetts|}, }