Space research : Vol. II : proceedings ; organized by the Committee on Space Research - COSPAR and Consiglio Nazionale delle Ricerche / Edited by H.C. van de Hulst, C. de Jager [and] A.F. Moore. International Space Science Symposium (2nd : 1961 : Florence, Italy) Hulst, H. C. van de (Hendrik Christoffel), 1918- COSPAR. Consiglio nazionale delle ricerche (Italy) Cosmic physics Congresses. Geophysics Congresses. Space sciences Congresses. 629.1388 INS Includes Index. Amsterdam : North-Holland Pub. Co., c1961. c1961. 1961 Text 1241 p. : eng