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"Richard Zsigmondy as Man and Teacher"
Richardi Watson, A.M. Coll. Sacro-Sanctae Trin. Soc. et chemiae professoris in academia Cantabrigiensi, : institutionum chemicarum in praelectionibus academicis explicatarum, pars metallurgica
Richtiger und vermehrter Feld-Messer wie auch Sonnen-Uhren-Macher, ohne Lehrmeister und ohne Instrument; etc. ... von einem dieser Kunsten Curieusen Liebhaber
Rider's British Merlin : for the year of our Lord God 1783. Being the third after bissextile, or leap year
"Rigas kalendarnuja"
Rijks Universiteit Utrecht: 350 Jaar Verzamelaar
"Rings and Menhirs: Geometry and Astronomy in the Neolithic Age"
Rio d Brasil
Rio de Janeiro : historia de sus denominaciones
Risposta Di D. Giambattista de Girolami Parroco Di Faeo All' autore dell'articolo inserito nella Gazzetta Urbana 10 Luglio 1793 pag 435, sul proposito della suo scoperta ec. indicata nel libretto Modo ec.
Rittenhouse: Journal of the American Scientific Instrument Enterprise
Riyad al-Mukhtar. Mirat al-miqat wa-l-adwar ma'a majmu'at al-ashkal
Robert Boyle and Seventeenth-Century Chemistry
Robert Boyle e la Scienza Virtuosa
Robert Boyle: Pioneer of Experimental Chemistry
"Robert Child"
Robert Dick
Robert Dick: Baker, of Thurso Geologist and Botanist
Robert Edmond Grant (1793-1874) and his Museum of Zoology and Comparative Anatomy
"Robert Erskine (1735-1780) of the Continental Army: Geographer and Surveyor-General"
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