Note III-1 — Chapter III · AIR-BORNE UFOS: BALLOONS TO BUBBLES
Reading edition
Ruppelt, E. J. The Report on Unidentified Flying Objects. Garden City, N.Y.: Doubleday & Co., 1956.
Reading edition
Ruppelt, E. J. The Report on Unidentified Flying Objects. Garden City, N.Y.: Doubleday & Co., 1956.