THE EXTENSION 29 
Wild Life of Orchard and Field. By Ernest Ingersoll 
FLAGD er BLOSss INOW VOLK. coiceie eters iets she otens aeteie s 1.40 
Citizen Bird. By Mabel Osgood Wright and _ Elliott 
Covwes?« “Macnillan= Cos NEw YOrks jeer. -)<-scle ones $1.50 
Bird Life. By Frank M. Chapman 
DirAppletonacc. CO; eNGwW? YORK ss. sarc cre ace 2.00 
Bird Studies with a Camera. By Frank M. Chapman 
Ds Ap plevonivC Os NG Waa VOT KK eset srelaoneber fone tvamoveseys, coke eo 
The American Natural History. By W. T. Hornaday 
Charles Scribners Sons, New York .............. 3.50 
Magazines devoted to Bird Study: 
Bird Lore (Official publication of the National Asso- Yr. 
ciation of Audubon Societies. Very useful for 
schools. Offered as a premium by the North 
Dakota Audubon Society with membership.) D. 
Appleton és) (COs oONEW, SVORK. 2 eo siniae pelcciesee ches 6 $1.00 
The Condor (Published by Cooper Ornithological 
Club) Address J. Eugene Law, Hollywood, Cal. 1.50 
The Auk (A quarterly journal the official publication 
of the Amercan Ornithologists Union). Address 
Jonathan Dwight, Jr., 134 West 71st. St. New York 3.00 
Publications of the Bureau of Biological Survey, Unit- 
ed States Department of Agriculture, especially useful in 
the study of North Dakota birds. 
NOTE: Application for publications in this list should be 
made to the Editor and Chief of the Division of Publications, Unit- 
ed States Department of Agriculture, Washington, D. C. The edi- 
tions of some of the publications are necessarily limited, and 
when the supply is exhausted and no funds are available for pro- 
curing additional copies, applicants are referred to the Superin- 
tendent of Documents, Government Printing Office, who has them 
for sale at a nominal price, under the law of January 12, 1895. 
Many of these publications may be obtained as “Package Librar- 
ies” from the Agricultural College. 
In applying give name and number of the bulletin and the 
name of the bureau of Biological Survey. 
BULLETINS: 
Bulletin 13. Food of the Bobolink, Blackbirds and Grackles 
sf 15. The Relation of Sparrows to Agriculture 
SS 17. Birds of a Maryland Farm—A local study 
ie 18. Distribution and Migration.of North American Warblers 
s 21. The Bobwhite and Other quails of the United States 
in their Economic Relations 
sg 23. The Horned Larks and Their Relation to Agriculture 
$ 24. The Grouse and Wild Turkeys of the United States 
and Their Economic Value 
s 26. Distribution and Migration of North American Ducks, 
Geese and Swans ; 
sf 27. The North American Eagles and Their Economic Re- 
lations. 
ee 32. Food Habits of the Grosbeaks 
= 
