Scale 1:500,000 (W 102°00ʹ--W 97°50ʹ/N 40°00ʹ--N 37°00ʹ).
Note
Relief shown by contours and spot heights. Blue line print. "Open-file report 81-1004"--Struck out on margin. "85-4009"--Hand-lettered in margin.
Bibliography Note
Includes text and bibliographical references.
Action Note
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