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41“...United States Department of the Interior, Geological Survey,...”
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42Published 1958“...Department of the Interior, United States Geological Survey,...”
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43Published 1979“...Department of the Interior, United States Geological Survey,...”
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44“...United States Department of the Interior, Geological Survey,...”
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45by Pierce, C. H. (Charles Henry), 1878-“...United States Department of the Interior, Geological Survey,...”
Published 1941
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46by Corbett, Don M.“...United States Department of the Interior, Geological Survey,...”
Published 1962
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47by Woodring, W. P. (Wendell Phillips), 1891-1983“...United States Department of the Interior, Geological Survey,...”
Published 1957
University of Florida Digitized Panama Canal Collection
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48“...United States Department of the Interior, Geological Survey,...”
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49by Cross, Whitman, 1854-1949“...Department of the Interior, United States Geological Survey,...”
Published 1883
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50by Williams, Albert, 1852-1914“...Department of the Interior, United States Geological Survey,...”
Published 1883
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51by Williams, Henry Shaler, 1847-1918“...Department of the Interior, United States Geological Survey,...”
Published 1884
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52Published 1988“...Department of the Interior, United States Geological Survey,...”
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53“...Department of the Interior, United States Geological Survey,...”
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54“...Department of the Interior, United States Geological Survey,...”
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55“...Department of the Interior, United States Geological Survey,...”
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56by Walcott, Charles D. (Charles Doolittle), 1850-1927“...Department of the Interior, United States Geological Survey,...”
Published 1884
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57by Call, Richard Ellsworth, 1856-1917“...Department of the Interior, United States Geological Survey,...”
Published 1884
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58by Dana, Edward Salisbury, 1849-1935“...Department of the Interior, United States Geological Survey,...”
Published 1884
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59“...Department of the Interior, United States Geological Survey,...”
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60by White, Charles A. (Charles Abiathar), 1826-1910“...Department of the Interior, United States Geological Survey,...”
Published 1885
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