Easy contact was made on that fateful day with what obviously turned out to be a heretofore unknown type of UFO. I had hesitated for weeks to turn my cloudbuster pipes toward a "star," as if I had known that some of the blinking lights hanging in the sky were not planets or fixed stars but SPACE machines. With the fading out of the two "stars," the cloudbuster had suddenly changed into a SPACEGUN. From then onward, too, our approach to the problem of space became positive, affirmative, confident in using our carefully screened data.

Contact with Space (1957)