User-friendly Questar

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Questar advertisement, <em>Sky and Telescope</em>, August 1989 — Questar advertisement, *Sky and Telescope*, August 1989. Questar Corporation

Sky and Telescope, August 1989, IFC.
Sky and Telescope, September 1989, IFC.
Sky and Telescope, June 1990, IFC.
Astronomy, September 1990, IBC.
Sky and Telescope, October 1990, IFC.
Astronomy, January 1991, 91.
Sky and Telescope, March 1991, IFC.
Astronomy, March 1991, 21.
Astronomy, May 1991, 28.
Astronomy, June 1991, 25.
Sky and Telescope, September 1991, IFC.

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Questar advertisement, <em>Scientific American</em>, August 1989 — Questar advertisement, *Scientific American*, August 1989. Questar Corporation

Scientific American, August 1989, 111.
Scientific American, September 1989, 189.
Scientific American, February 1990, 64.
Scientific American, May 1990, 41.
Scientific American, October 1990, 32.