Space: a call for action : proceedings of the 10th annual international space development conference, May 22-27, 1991, San Antonio, Texas / edited by Robert C. Blackledge, Carol Luckhardt Redfield, Steven B. Seida. -- San Diego : Univelt Inc., 1991. -- xvii, 385 s. : obr. ; 25 cm. -- ISBN 0-912183-05-5. astronautika * lety kozmické * kozmonautika