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31. Federal-aid highways the national system of interstate and defense highways, the federal-aid primary highway system with the U.S. numbered system and other major highways /
United States. Federal Highway Administration. The Administration,.
32. Forest type groups of the United States
United States. Forest Service. The Service,.
33. Generalized structural lithologic and physiographic provinces in the fold and thrust belts of the United States : exclusive of Alaska and Hawaii
Bayer, K. C. U. S. Geological Survey,.
34. Geologic investigations /
The Survey ;.
35. Geologic investigations series /
The Survey,.
36. Geologic map of the United States (exclusive of Alaska and Hawaii).
King, Philip B., 1903-1987. Geologic Survey,.
37. Geologic map of the United States (exclusive of Alaska and Hawaii)
King, Philip B., 1903-1987. Geological Survey,.
38. Geologic quadrangle map /
Geological Survey (U.S.). U.S. Geological Survey,.
39. Geologic quadrangle map /
Geological Survey (U.S.). U.S. Geological Survey,.
40. Geologic quadrangle maps of the United States
Geological Survey (U.S.). U.S. Geological Survey,.