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3 1/2-inch Questar Photographs the Face of the Sun

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Questar advertisement, <em>Scientific American</em>, September 1971
Questar advertisement, Scientific American, September 1971. Questar Corporation

Scientific American, September 1971, 20.
Natural History, October 1971, 96.
Natural History, January 1972, 24.
Scientific American, February 1972, 7.
Natural History, May 1972, 90.
Scientific American, July 1972, 49.
Scientific American, August 1973, 87.
Scientific American, February 1974, 123.