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Professional Paper, Issue 215

Geology - 1948 - 220 pages
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Professional Paper, Issues 211-214

Geology - 1947 - 678 pages
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Professional Paper, Issues 203-207

Geology - 1943 - 1018 pages
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Professional Paper, Issue 196

Geology - 1942 - 382 pages
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Professional Paper, Issue 186

Geology - 1940 - 448 pages
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Professional Paper, Issues 194-195

Geology - 1940 - 448 pages
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Professional Paper, Issues 190-193

Geology - 1938 - 540 pages
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Professional Paper, Issues 187-189

Geology - 1937 - 726 pages
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Professional Paper, Issues 182-184

Geology - 1936 - 494 pages
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Professional Paper, Issue 185

Geology - 1936 - 294 pages
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