Questar made frequent use of the photography of Hubert Entrop in the company’s marketing. The following is a list of magazine advertisements that featured his work.
Scientific American, February 1968.
Sky and Telescope, August 1971.
Sky and Telescope, December 1971.
Sky and Telescope, February 1972.
Sky and Telescope, May 1972.
Sky and Telescope, March 1973.
Sky and Telescope, September 1973.
Sky and Telescope, February 1975.
Sky and Telescope, May 1975.
Natural History, August-September 1975. via archive.org
