REFERENCES
Relation Between Birds and Insects. Yearbook 486.
Annual Reports of the Smithsonian Institution.
Annual Reports of the National Audubon Society.
Bird Day. How to Prepare For It. C. C. Babcock.
Bird Neighbors. John Burroughs.
Bird enemies. John Burroughs.
How to Attract the Birds. N. B. Doubleday.
The Food of Nestling Birds. Yearbook 1900.
Does It Pay the Farmer to Protect Birds? Yearbook 1907.
Birds as Weed Destroyers. Yearbook 1898.
How Birds Affect the Orchard. Yearbook 1900.
Value of Swallows as Insect Destroyers. Yearbook Reprint.
Birds That Eat Scale Insects. Yearbook Reprint.
Birds Useful for the Destruction of the Cotton Boll-Weevil. Dept. of Agriculture Bulletins 57, 64.
Hawks and Owls From the Standpoint of the Farmer. Dept. of Agriculture Bulletin 61.
Some Common Birds in Their Relation to Agriculture. Dept. of Agriculture Bulletin 54.
Four Common Birds of the Farm and Garden. Yearbook 1895.