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Collection of 12 covers signed in ink or felt tip by one or more notable scientists, including: Christiaan Barnard; Norman Borlaug; Melvin Calvin; Michael DeBakey; Gertrude B. Elion; William Alfred Fowler; Roger Guillemin; Linus Pauling; Albert Sabin; Glenn T. Seaborg; Glenn T. Seaborg and Gerhard Herzberg (with NASA Station Director L. H. Odenthal); and Glenn T. Seaborg and James Van Allen. In fine overall condition.
