Inside front cover; published in cooperation with the National Social Welfare Assembly.
Later appears in DC comics cover-dated April 1967.
Story continues in Action Comics #312.
Red Kryptonite previously split Superman and Clark in Action #293; an experiment conducted by Superman in this issue causes the Red K effect to be duplicated, when ordinarily Red K does not affect Superman in the same way twice.
Script added by Bob Bailey, 2005-03-19 (Per Sandell ed.)
Author credits from Action Comics #316 lettercolumn, originally listed as Robert Bernstein, corrected by Jim Walker, Jan. 2010
house ad for Hawkman (DC, 1964 series) #1, on sale February 29
in Adventure Comics (DC, 1938 series) #390 (March 1970) [title changed to "Supergirl's Cowboy Hero"]
in 80 Page Giant (DC, 1964 series) #G69 (March-April 1970)
in Showcase Presents: Supergirl (DC, 2007 series) #2 ([December] 2008)origin of Comet retold
letters submitted by Ernest A. Sutcliffe Jr.; Carol Ann Lovene; Monica McGowan; Thomas Staniszewski; Billy Monk; E. K. Deen