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1
Available in Social Science Premium Collection.
Available in Proquest Periodicals Archive Online Collection 3.3.
Available in Science Database.
Available in Social Science Database.
Available in JSTOR Arts & Sciences VII Archive Collection.
Electronic
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2
Imprint 1950
Available in Gale Academic OneFile.Available in Academic Search Complete.
Available in Military & Government Collection.
Available in MAS Ultra - School Edition.
Available in Gale OneFile: Popular Magazines.
Available in Gale In Context: Biography.
Available in Gale Academic OneFile Select.
Available in Gale In Context: Environmental Studies.
Available in Science Database.
Available in Gale General OneFile.
Available in Gale In Context: Science.
Electronic
Journal
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