Est. $30 - 40 Satellites, Rockets and Outer Space with full color illustrations, paperback, Signet Key Book, New York. First printing 1958. Rockets, Missiles, and Space Travel, hardcover, The Viking press, New York, 1958. Satellites, Rockets and Outer Space, paperback, Signet Science Library, New York, revised printing 1962. Missiles, Moonprobes and Megaparsecs, illustrated, paperback, Signet Science Library, New York, First printing 1964. (2) On Earth and in the Sky, paperbacks, Ace Book, New York, 1967. Another Look at Atlantis, paperback, Ace Book, New York, 1969. Watchers of the Skies, hardcover, The Viking Press, New York, 1966. The Borders of Mathematics, illustrated with diagrams and tables, paperback, Pyramid Books, New York, 1967. (2)