Sagan, Carl & Page, Thornton (editors): UFO's - a scientific debate

Proceedings of a symposium sponsored by the American Association for the Advancement of Science (AAAS) held in Boston, Mass., on December 26 and 27, 1969. Contributions by Robert M.L. Baker, Frank D. Drake, Lester Grinspoon, Robert L. Hall, Kenneth R. Hardy, William K. Hartmann, J. Allen Hynek, James E. McDonald, Donald H. Menzel, Philip Morrison, Thornton Page, Alan D. Persky, Douglass R. Prince-Williams, Franklin Roach, Carl Sagan and Walter Sullivan.

1972, Cornell University Press, Ithaca, New York

Hardcover, 310 pages, index, illustrated

1973, second printing
ISBN: 0-8014-0740-0