'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.
A second Asimov double : The big sun of Mercury; [and], The oceans of Venus by Isaac Asimov. ISBN 0450014738. Published by New English Library. Publication and catalogue information, links to buy online and reader comments.