Physical description for original version: 22 p. : 28 cm
原資料等に関する注記
原資料の出版事項: Pasadena, Calif. ; [Washington, D.C. : National Aeronautics and Space Administration, Jet Propulsion Laboratory, California Institute of Technology : For sale by Supt. of Docs., U.S. G.P.O., 1989]