48 UNIVERSITY OF COLORADO. 



Warren, Edward R. Swallows and Bedbugs. The Condor, Vol. XV, pp. 

 14-16, 1913. 



Weed, Clarence M. The Winter Food of the Chickadee. New Hampshire 



College, Agric., Exper. Sta., Bull. No. 54, 1898. 



An Observation on the Feeding Habits of the Chipping Sparrow. New 

 Hampshire College, Agric. Exper. Sta., Bull. No. 55, 1898. 



Weed, Clarence M., and Dearborn, Ned. Birds in Their Relation to Man. 

 1903. With extensive bibliography. 



Williams, R, W. Game Commissioners and Wardens. Their Appointment, 

 Powers and Duties. U. S. Biol. Surv., Bull. No. 28, 1907. 



Wright, Mabel Osgood. National Audubon Society, Educational Leaflets: 

 No. 24. The Bluebird. No. 25. The Red-winged Blackbird. No. 26 

 The Baltimore Oriole. No. 27. The Indigo Bunting. No. 28. The Purpli 

 Finch. No. 29. The Herring or Harbor Gull. No. 30. The Snowflake. 

 No. 31. The Song Sparrows. No. 32. The Barn Swallow. No. 33. The 

 Tree Swallow. No. 34. The Golden-crowned Kinglet. The Ruby- 

 crowned Kinglet. No. 35. American Crossbill. White-winged Cross- 

 bill. No. 39. The House Wren. No. 56. The Ruby-throated Humming- 

 bird. 



