[70]From “Birds of Eastern North America,” by Frank M. Chapman.
[71]From “Early Spring in Massachusetts,” by H. D. Thoreau, pages 160 and 161.
[72]Farmers’ Bulletin 630, U. S. Dept. of Agriculture, Biological Survey.
[73]From “Useful Birds and Their Protection,” by E. H. Forbush, pages 261 and 262.
[74]Farmers’ Bulletin 513, U. S. Department of Agriculture, Biological Survey, H. W. Henshaw.
[75]Bulletin No. 37, U. S. Dept. of Agriculture, Biological Survey.
[76]The Auk, IV, 194, 195, 1887. O. P. Hay.
[77]From “Birds of Eastern North America,” by Frank M. Chapman, used with permission of D. Appleton & Co.
[78]Farmers’ Bulletin 506, U. S. Dept. of Agriculture, Biological Survey.
[79]Farmers’ Bulletin 513, U. S. Dept. of Agriculture, Biological Survey.