The most important paper in the history of rocketry:
Robert Goddard's "A Method of Reaching Extreme Altitudes"
first edition in scarce original wrappers,
The Horblit copy

If a rocket apparatus such as here has been discussed were projected to the upper end of interval s8, either with an acceleration of 50 or 150 ft./sec.2, and this acceleration were maintained to a sufficient distance beyond s8, until the parabolic velocity were attained, the mass finally remaining would certainly never return."

First edition, first printing in original wrappers of Robert Goddard's famous explanation of the powerful potential of rocketry and, specifically, on the possibility of projecting an object beyond the atmosphere of the Earth. 

"Goddard, a physics professor at Clark University in Worcester, Mass., had published an arid little paper on an outrageous topic, rocket travel. Unlike most of his colleagues, Goddard believed rocketry was a viable technology, and his paper, primly titled "A Method of Reaching Extreme Altitudes," was designed to prove it. For the lay reader, there wasn't much in the writing to excite interest, but at the end, the buttoned-up professor unbuttoned a bit. If you used his technology to build a rocket big enough, he argued, and if you primed it with fuel that was powerful enough, you just might be able to reach the moon with it." (Time 100). At the time of publication, Goddard was widely ridiculed as a hopeless dreamer;  his work would, of course, later be recognized as providing the foundation for the modern space age.

With 25 photographic plates on 10 pages. The most influential paper in the field of rocketry. Provenance: from the library of Harrison D. Horblit, one of the most celebrated book collectors of the 20th century, with his bookplate on the custom box. Some chipping to wrappers (as pictured), very light abrasion to front wrapper. Interior fine. Rare.