Mirrors Made of Quartz

1 Page Vertical

Questar advertisement, <em>Sky and Telescope</em>, February 1966 — Questar advertisement, *Sky and Telescope*, February 1966. Questar Corporation

Sky and Telescope, February 1965, IFC.
Sky and Telescope, March 1965, IFC.
Sky and Telescope, November 1965, IFC.
Sky and Telescope, February 1966, IFC.

The Best Telescopes Will Have Quartz Mirrors

2/3rds Page Vertical

Questar advertisement, <em>Natural History</em>, February 1965 — Questar advertisement, *Natural History*, February 1965. Questar Corporation

Natural History, February 1965, 61.
Scientific American, February 1965, 85.
Natural History, March 1965, 59.
Scientific American, March 1965, 139.
Natural History, April 1965, 60.
Scientific American, April 1965, 149.
Modern Photography, April 1965, 10.
Modern Photography, May 1965, 26.
Scientific American, February 1966, 8.
Natural History, March 1966, 19.