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Monthly Catalog 1895-1976

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    Research paper RP1787-RP1788, RP1791-RP1795, RP1797, RP1799-RP1800, RP 1803, RP1805-RP1806. RP 1803. Compensation of aperture ratio markings of photographic lens for absorption, reflection, and vignetting losses; by Irvine C. Gardner.