. Bulletin - Biological Survey. Zoology, Economic. p Bulletin No. 10 U. S. DEPARTMENT OF AGRICULTURE DIVISION OF BIOLOGICAL SURVEY LIFE ZONES AND CROP ZONES THE UNITED STATES C. HART TVIERRIATVI Chief, Biological Survey. WASHINGTON government printing office i8q8. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Bureau of Biological Survey. Washington : Govt. print. off.

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