EXPLORING THE COSMOS.
Boston: Little Brown, 1977. Second edition. 435 pages. More
Boston: Little Brown, 1977. Second edition. 435 pages. More
New York: Penguin Books, 1997. First printing. 228 pages. More
New York: Harper & Row, 1978. First edition. 205 pages. More
London: Blackwell, 1950. Fifth impression. More
Seattle: University of Washington, 1964. First edition. More
Akron: Werner, N.D, circa 1900. 428 pages; International Science Library; Ownership signature of Otto Julius Zobel, dated 1905. More
New York: Houghton Mifflin, 1976. More
Akron: Werner, N.D, circa 1900. 375 pages; International Science Library; Ownership signature of Otto Julius Zobel, dated 1905. More