Challenge of the universe Hynek, Joseph Allen creator text xx New York Scholastic Book Services [1962] 1962 monographic eng
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143 p. illus. 20 cm. Student activities by Norman D. Anderson. Illustrated by Helmut Wimmer. Advisory group: research scientist, Nancy G. Roman; science educator, John S. Richardson; science teacher, Norman D. Anderson. Includes bibliography. Astronomy QB44 .H9 523.1 Vistas of science, 4 62013888 750519 20160527191014.0 128767