ELEMENTARY

Hunter, _Laboratory Problems in Civic Biology_, American

Book Company.

Bulletin of U. S. Department of Agriculture, _Division of

Biological Survey_, Nos. 1, 6, 13, 17.

Davison, _Practical Zoology_. American Book Company.

Ditmars, _The Reptiles of New York_. Guide Leaflet 20. Amer.

Mus. of Nat. History.

Sharpe, _A Laboratory Manual in Biology_, pp. 140-150,

American Book Company.

Walker, _Our Birds and Their Nestlings_. American Book

Company.

Walter, H. E. and H. A., _Wild Birds in City Parks_.

Published by authors.

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