A second Asimov double The big sun of Mercury; [and], The oceans of Venus
Asimov, Isaac,1920-1992.
Asimov, Isaac,1920-1992.Big sun of mercury.
Asimov, Isaac,1920-1992.Oceans of Venus.
London New English Library
1973
'The big sun of Mercury' originally published under the name Paul French as 'Lucky Starr and the big sun of Mercury'. Garden City [N.Y.]: Doubleday, 1956
'The oceans of Venus' originally published under the name Paul French as 'Lucky Starr and the oceans of Venus'. Garden City [N.Y.]: Doubleday, 1954