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Nature of Optical Excellence

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Questar advertisement, <em>Sky and Telescope</em>, May 1978
Questar advertisement, Sky and Telescope, May 1978. Questar Corporation

Sky and Telescope, April 1978, IFC.
Sky and Telescope, May 1978, IFC.

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Questar advertisement, <em>Scientific American</em>, April 1978
Questar advertisement, Scientific American, April 1978. Questar Corporation via jstor.org

Scientific American, April 1978, 159.
Scientific American, May 1978, 167.