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"Penicillin in Perspective" "Penicillin" Penicillin, a Dramatic Story "Penicillin: Its Development for Medical Uses" Pennsylvania Clocks and Clockmakers: An Epic of Early American Science, Industry, and Craftsmanship "Pensiero matematico e pensiero fisico" Pensou-se em Vasco da Gama para comandar a armada que descobriu o Brasil People in Camera 1839-1914 "Periodic orbits" Periodicals Catalogue Periodicity and variation of solar (and lunar) eclipses "Periscopes for Rear Vision" "Perkin and the Dyestuffs Industry in Britain" Perkin Centenary London: 100 years of synthetic dyestuffs "Perpetual Motion Machines and their Design in Ancient India" "Perpetual Motion: Illusion and Reality" Perpetuum Kalendarium Astronomicum "'Perpetuum Mobile': The Invention of Rolling Ball Clocks in The Seventeenth Century" "Perpignan 1356" Perpignan 1356: The Making of a Tower Clock and Bell for the King's Castle
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