Art credits identified by Jim Vadeboncoeur Jr.
Script, pencils, inks credits from the U.S. Copyright Renewal Office's listing for the original story "Hero of Darien; the story of Vasco Nunez de Balboa" authors, Maxine Shore and M. M. Oblinger. Illustrated by Avery Johnson. original copyright date July 30, 1941, renewed January 31, 1969. Registration Number: A156630. Renewal ID Number: R454980.
Maxine Shore and M. M. Oblinger wrote stories and text pieces for True Comics, and were highly likely the ones who wrote this material and perhaps Avery Johnson as artist also. (all information provided by Alexa Dickman, June 1, 2015, via the Comics History Exchange page on Facebook).