@book{bhlitem49437, title = {Forty years notes of a field ornithologist }, copyright = {Public domain. The BHL considers that this work is no longer under copyright protection.}, url = {https://www.biodiversitylibrary.org/item/49437}, note = {https://www.biodiversitylibrary.org/bibliography/14117}, publisher = {Philadelphia, Press of J.H. Weston, 1879}, author = {Krider, John.}, year = {}, pages = {112}, keywords = {Birds|United States|}, }