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Letter from Ravneberg

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Questar advertisement, <em>Sky and Telescope</em>, February 1988
Questar advertisement, Sky and Telescope, February 1988. Questar Corporation

Sky and Telescope, October 1987, IFC.
Sky and Telescope, November 1987, IFC.
Sky and Telescope, February 1988, IFC.
Sky and Telescope, May 1988, IFC.
Sky and Telescope, May 1989, IFC.
Sky and Telescope, October 1989, IFC.
Sky and Telescope, January 1990, IFC.
Sky and Telescope, December 1990, IFC.