Ray Castillo Headquarters, Washington, DC July 16, 1998 (Phone: 202/358-4555) NOTE TO EDITORS: N98-47 NASA PRODUCES THIRD VOLUME OF "EXPLORING THE UNKNOWN " Today, NASA unveils Exploring the Unknown: Selected Documents in the History of the U.S. Civil Space Program, Volume 3: Using Space, edited by John M. Logsdon, with Roger D. Launius, David H. Onkst, and Steven J. Garber. Exploring the Unknown is an essential reference series for anyone interested in the history of the U.S. civil space program and its development over time. Using Space is the third book in the six volume series that contains a selection of key documents, many of which are available for the first time, and provides insight into the U.S. civil space program. The three major sections of this book -- History of Satellite Communications, Observing the Earth from Space, and Space as an Investment in Economic Growth -- include essays and critical documents in the history of space flight. Further, each document is introduced by a headnote to provide context, bibliographic details, and background information to enlighten the reader as necessary. The first two volumes of the Exploring the Universe series are: Organizing for Exploration and External Relationships. The three future volumes will trace the evolution of space transportation, human space flight, and space science. John M. Logsdon, Director of the Space Policy Institute at the George Washington University, will be signing the new book this evening, from 5:30 - 7:00 pm, in the NASA Headquarters Library. NASA Headquarters is located at the corner of 4th and E Streets, SW, in Washington, DC. Any reporter wishing to attend the book signing or to obtain a copy of the book should contact NASA Senior Historian Roger Launius at 202/358-0383. -end-