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1
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Imprint 1947
Available in EBSCO Open Access Journals.Available in SAO/NASA Astrophysics Data System (ADS).
Electronic
Journal
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Imprint 2003
Available in Central Online + Open Access Library (COOL).Available in Gale Academic OneFile.
Available in EBSCO Open Access Journals.
Available in Gale Academic OneFile Select.
Available in Gale In Context: Environmental Studies.
Available in Gale In Context: Science.
Electronic
Journal
7
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9
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11
Imprint 1941
Available in Gale Academic OneFile.Available in Academic Search Complete.
Available in Gale OneFile: Popular Magazines.
Available in Gale In Context: Biography.
Available in Gale Academic OneFile Select.
Available in Gale General OneFile.
Available in Gale In Context: Science.
Electronic
Journal
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