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Libros electrónicos
Studies on the Fauna of Hot Springs in the Western United States and the Biology of Thermophilous Animas
Gratis
Fossil Parasitic and Phytophagous Hymenoptera from Florissant, Colorado
Gratis
A New Species of Peripatus from the Mountains of Northern Peru
Gratis
Insects and Human Welfare: An Account of the More Important Relations of Insects to the Health of Man, to Agriculture, and to Forestry
Gratis
Collected Papers: Volume 2
Gratis
On the Interpretation of Certain Tropisms of Insects
Gratis
New and Little-known Guests of the Texas Legionary Ants
Gratis
Three New Hymenopterous Parasites of Pegomyia Brassicae, Bouche
Gratis
The Grasses of Milwaukee County, Wisconsin
Gratis
Notes on the Life History of the Stylopidae
Gratis
Is Mutation a Factor in the Production of Vestigal Wings Among Insects
Gratis
The Correlation Between Habits and Structural Characters Among Parasitic Hymenoptera
Gratis
Key to the Families of North American Insects: An Introduction to the Classification of Insects
Gratis
The Chemical Nature of Some Insect Secretions
Gratis
How to Make the Garden Pay: A Manual for the Intensive Cultivation of Home Vegetable Gardens
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Gratis
The Cotton Bollworm
Gratis
Insects and human welfare
Gratis
The Mexican Cotton Boll Weevil: A Revision and Amplification of Bulletin 45, to Include the Most Important Observations Made in 1904, Volumes 50-53
Gratis
Catalogue of Exhibits of Insect Enemies of Forests and Forest Products at the Louisiana Purchase Exposition, St. Louis, Mo., 1904: Volumes 45-50
Gratis
Catalogue of Exhibits of Insect Enemies of Forests and Forest Products at the Louisiana Purchase Exposition, St. Louis, Mo., 1904: Volumes 44-50
Gratis