Russian Economic Ornithology The Food of Aquatic Game Birds V. I. Tichvinsky The Biology of the Reddish Ground-Squirrel (Citellus rufescens Keys. et Blas) V. I. Tichvinsky On the Biology of the Steppe Lemmer (Lagurus lagurus Pall.) and Experiments for Its Control N. M. Sewenov Materials on the Food of the Birds of Prey J. V. Jarkoff V. P. Teploff
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