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The Five Focal Lengths of Questar MFL

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Questar advertisement, <em>Industrial Research & Development</em>, June 1985
Questar advertisement, Industrial Research & Development, June 1985. Questar Corporation via archive.org

Industrial Research & Development, August 1984, 126.
Industrial Research & Development, April 1985, 164.
Industrial Research & Development, June 1985, 186.