New York, NY: Bell Telephone Laboratories 1949. Later printing. 1-12 pages. 8 1/2 x 11 inches. Publisher's printed grey, blue and black wrappers. 5 hole punched at the spine as issued. Ex-library stamp on front cover dated Aug 11, 1949. Otherwise unmarked. Bell Telephone System Technical Publications, Monograph # B-1644. Near Fine. Wraps. 
"Hartley's [Transmission of Information, 1928] results, published before the end of [the 1920s], were to be guiding rules for transmission engineers for nearly 20 years, giving way to a more comprehensive theory only when Claude Shannon would carefully examine the effect of noise [as here] on the ability of a system to preserve faithful indications of amplitude." (A History of Engineering & Science in the Bell System, The Early Years, p 909).
The original manuscript of this paper was received by the Institute of Radio Engineers July 23, 1940. It was presented at the IRE National Convention in New York on March 24, 1948 and November 12, 1947 (IRE New York Section). It was first published in the Proceedings of the Institute of Radio Engineers, Volume 37, pp 10-21 in January 1949, for which an offprint was recently discovered. While this separate edition is dated 1949, it unknown when in 1949 it was published. The library accession stamp of Aug 11, 1949 plus the knowledge that the Monograph series was issued almost always after the original publication date leads us to believe the IRE offprint predates this publication. The price has been significantly reduced to account for the difference in publication precedence while recognizing it's value to collectors as a Bell System publication.
Literature: Sloane and Wyner, "Claude Elwood Shannon Collected Papers" #43 (referring to the Proceedings Institute of Radio Engineers issue).
COLLECTORS NOTE: The Bell System Monograph series is not an offprint series although it is often incorrectly referred to in this manner. It was rather a publication of Bell Telephone Laboratories used to widely distribute (primarily to libraries and large corporations) research articles written by Bell System employees in a variety of widely dispersed publications (including but certainly not limited to the Bell System Technical Journal). The series therefore represents a much broader selection of Bell System research than the Bell System Technical Journal did. Collectors prize this series as they are often (but not always) the first separate appearance of a paper and hence are the closest one can get to the elusive and ever sought after offprint.