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william j baerg
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Birds of Arkansas
William J. Baerg · Agriculture Experiment Station, University of Arkansas College of Agriculture
188 sayfa · 1931
Birds
The black widow and five other venomous spiders in the United States
William J. Baerg · Agricultural Experiment Station, Univ. of Arkansas]
43 sayfa · 1959
Spiders / Arachnidism / Black widow spider
Introduction to applied entomology
William J. Baerg · Burgess publishing co.
169 sayfa · 1942
Insects, Injurious and beneficial / Injurious and beneficial Insects / Insect pests / Beneficial insects / Insecta