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Published 1946
Full text available in Google Magazines: 1945 - 1998Full text available in Environment Complete: 1990 to present; embargo: 1 year
Full text available in Academic Search Premier: 1945 to present; embargo: 1 year
Full text available in EBSCO Open Access Journals: 1946 - 1998
Full text available in SAGE Journals: 2010 - 2015
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