Valuable Teaching Tool

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Questar advertisement, <em>Sky and Telescope</em>, January 1967 — Questar advertisement, *Sky and Telescope*, January 1967. Questar Corporation via archive.org

Sky and Telescope, September 1966, IFC.
Sky and Telescope, January 1967, IFC.
Science Teacher, April 1967, 6.
Sky and Telescope, November 1967, IFC.
Audubon, November-December 1967, 13.

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Questar advertisement, <em>Natural History</em>, October 1967 — Questar advertisement, *Natural History*, October 1967. Questar Corporation

Natural History, January 1967, 6.
Scientific American, January 1967, 108.
Natural History, April 1967, 63.
Scientific American, April 1967, 141.
Natural History, October 1967, 17.
Scientific American, October 1967, 56.