in Supermann (Williams Forlag, 1969 series) #21/1970 ([november] 1970)
in Superman Supacomic (K. G. Murray, 1959 series) #136 (Circa December 1970)
in Superman (Egmont Ehapa, 1966 series) #19/1970 (19.September 1970)
in Supermann (Williams Forlag, 1969 series) #21/1970 ([november] 1970)
in Superman Supacomic (K. G. Murray, 1959 series) #136 (Circa December 1970)Script credit is given in letter column of Superman #230.
in Supermann (Williams Forlag, 1969 series) #20/1970 ([oktober] 1970)
in All Star Adventure Comic (K. G. Murray, 1959 series) #76 ([August 1972] ?)