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Goddard Memorial Symposium (23rd : 1985 : Maryland )：Europe/United States space activities : 19th European Space Symposium ．V.61，supplement to Advances in the Astronautical Science
Goddard Memorial Symposium.Pub. for the AAS by Univelt, Incorporated,1985.
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Space applications at the crossroads (21st : 1983 : Maryland )：Proceedings of the 21st AAS Goddard Memorial Symposium ．V.55，science and technology series; a supplement to advances
AmericanAstronauticalSociety,the 21st AAS Goddard Memorial Symposium.AAS,10983.
