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- Proceedings of the National Academy of Sciences of the ...
- Author: Wilson Edwin Bidwell
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- National Geographic Magazine, Volume CVI, July-December ...
- Author: Gorce John Oliver La (Ed.)
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- National Geographic Magazine, Volume LXV, January-June, ...
- Author: Grosvenor Gilbert
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- National Geographic Magazine, Volume LXVIII, July-Decem ...
- Author: Grosvenor Gilbert
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- Proceedings of the National Academy of Sciences of the United States of America, Volume 34, 1948.
- Original Era: 1948
- Subject: Hydroxyanthranilic Acid as a Precursor of Nicotinic Acid in Neurospora
- Publisher: Mack Printing Company
- Language: English
- Place of Publication: Easton, Pa.
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- Proceedings of the National Academy of Sciences of the United States of America, Volume 27, 1941.
- Original Era: 1941
- Subject: Mathematics, National Academy of Sciences proceedings
- Publisher: Mack Printing Company
- Language: English
- Place of Publication: Easton
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- Proceedings of the National Academy of Sciences of the United States of America, Volume 32, 1946.
- Original Era: 1946
- Publisher: Mack Printing Company
- Language: English
- Place of Publication: Easton, Pa.
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- Proceedings of the National Academy of Sciences of the United States of America, Volume 8, 1922.
- Original Era: 1922
- Author: Wilson Edwin Bidwell
- Subject: Mathematics and Astronomy topics including Riemann Geometry, Linear Functional, Stellar Distribution, and more.
- Publisher: Eschenbach Printing Company
- Language: English
- Place of Publication: Easton, Pa.
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- National Geographic Magazine, Volume LXXIII, January-June 1938.
- Original Era: 1938
- Subject: National Geographic Society Publication, Geographic knowledge and exploration dissemination.
- Publisher: National Geographic Society
- Language: English
- Place of Publication: Washington, D.C.
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- National Geographic Magazine, Vol. LXX (July-December), 1936.
- Original Era: 1936
- Subject: Exploration, Geography, Nature, Science, Culture
- Publisher: National Geographic Society
- Language: English
- Place of Publication: Washington, D.C.
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- National Geographic Magazine, Volume LXXX, July-December, 1941.
- Original Era: 1941
- Subject: Geography, Exploration, Nature, Culture
- Publisher: National Geographic Society
- Language: English
- Place of Publication: Washington, D.C.
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- National Geographic Magazine, Volume LXXVII, January-June, 1940.
- Original Era: 1940
- Subject: Geography, Exploration, and Photography
- Publisher: National Geographic Society
- Language: English
- Place of Publication: Washington, D.C.
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- National Geographic Magazine, Volume XLIII, February 1923.
- Original Era: 1923
- Publisher: National Geographic Society
- Language: English
- Place of Publication: Washington, D.C.
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- National Geographic Magazine, Volume XCI January-June, 1947.
- Original Era: 1947
- Subject: Geography, Exploration, Science, Natural History, World Cultures, Travel
- Publisher: Published by the National Geographic Society, Hubbard Memorial Hall
- Language: English
- Place of Publication: Washington, D.C.
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- National Geographic Magazine, Volume LXXXI January-June, 1942.
- Original Era: 1942
- Subject: Geographic and Scientific Exploration, World War II context
- Publisher: Published by the National Geographic Society, Hubbard Memorial Hall, Washington, D.C.
- Language: English
- Place of Publication: Washington, D.C.
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- Nation and the Athenaeum, Vol. XLVII, No. 1, April 5th, 1930.
- Original Era: 1930
- Subject: Political and social issues, Parliament discussions, Art reviews, and more.
- Publisher: Published weekly at 38, Great James Street, London, W.C.1.
- Language: English
- Place of Publication: London
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- National Geographic Magazine, Volume LXXXII, July-December 1942.
- Original Era: 1942
- Subject: Geography, Exploration, Natural History, Photography
- Publisher: Published by the National Geographic Society, Hubbard Memorial Hall
- Language: English
- Place of Publication: Washington, D.C.
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- National Geographic Magazine, Volume LXXXVIII, July-December, 1945.
- Original Era: 1945
- Subject: Geography, Photography, Cultural history, Science
- Publisher: National Geographic Society, Hubbard Memorial Hall
- Language: English
- Place of Publication: Washington, D.C.
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- National Geographic Magazine, Volume LXIII, January-June 1933.
- Original Era: 1933
- Subject: Geography, Nature, Exploration, 1933 Edition
- Publisher: National Geographic Society, Hubbard Memorial Hall
- Language: English
- Place of Publication: Washington, D.C.
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- National Geographic Magazine, Volume LXV, January-June, 1934.
- Original Era: 1934
- Subject: Geographic, Scientific, Exploratory Articles
- Publisher: National Geographic Society, Hubbard Memorial Hall
- Language: English
- Place of Publication: Washington, D.C.
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- Nation and the Athenaeum, Vol. XLVIII, No. 1, Saturday, October 4, 1930.
- Original Era: 1930
- Publisher: Published weekly at 38, Great James Street, London, W.C.1.
- Language: English
- Place of Publication: London
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- National Geographic Magazine, Volume CVI, July-December, 1954.
- Original Era: 1954
- Author: Gorce John Oliver La (Ed.)
- Subject: Geographic Knowledge and Exploration, Photography, Natural History, Cultural Studies
- Publisher: Published by The National Geographic Society
- Language: English
- Place of Publication: Washington, D.C.
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- National Geographic Magazine, Volume LXV, January-June, 1934.
- Original Era: 1934
- Author: Grosvenor Gilbert
- Subject: Geography, Exploration, National War Memorials in Europe
- Publisher: National Geographic Society
- Language: English
- Place of Publication: Washington, D.C.
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- National Geographic Magazine, Volume LXVIII, July-December, 1935.
- Original Era: 1935
- Author: Grosvenor Gilbert
- Subject: Geography, Exploration, Photography
- Publisher: National Geographic Society
- Language: English
- Place of Publication: Washington, D.C.