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Copernicus and Mars

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Questar advertisement, <em>Sky and Telescope</em>, February 1989
Questar advertisement, Sky and Telescope, February 1989. Questar Corporation

Sky and Telescope, February 1989, IFC.
Sky and Telescope, March 1989, IFC.
Sky and Telescope, June 1989, IFC.

2/3rds Page Vertical

Questar advertisement, <em>Scientific American</em>, March 1989
Questar advertisement, Scientific American, March 1989. Questar Corporation

Scientific American, March 1989, 97.
Scientific American, May 1989, 117.