Based on the 1904 novel "Green Mansions" by W. H. Hudson. Kanigher script credit and Kubert layout credit confirmed by Joe Kubert in BACK ISSUE #43 (TwoMorrows, September 2010).
Script incorrectly credited to Jack Oleck. Kanigher script per biblio info from Robin Snyder's The Comics #v14#6 (June 2003).