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Smithsonian

Magazine
Smithsonian is a science and nature magazine, and is the official journal published by the Smithsonian Institution in Washington, D.C., although editorially independent from its parent organization. The first issue was published in 1970. Wikipedia
First issue date: April 1970
Frequency: Monthly
ISSN: 0037-7333
Total circulation (June 2016): 1,840,077