Cover pencils credit from Julius Schwartz's editorial records, provided to the GCD by DC Comics; the records imply that Frank Giacoia was paid for the inks (25 January 2008)
Credits for script, pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics (April 2007).
Sequence added by Ed Boner, January 2009.
Information for this sequence from Arthur Lortie, September 2008. Location from Ed Boner, January 2009.
Letters asking scientific questions and responses. Sequence added by Ed Boner, January 2009.
Credits for script, pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics (April 2007).