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18. Together but not equal: amateurs and professionals in early American scientific societies. Numbers RL Rev Am Hist; 1976; 4(4):497-503. PubMed ID: 11610793 [No Abstract] [Full Text] [Related]
19. [Not Available]. Van der Pas PW Aere Perennius; 1975 Jan; 18():3-11. PubMed ID: 11633832 [No Abstract] [Full Text] [Related]