This issue has variants.
Letters page letter from Dean Mullaney.
in Classic X-Men (Marvel, 1986 series) #8 (April 1987)
in The Official Marvel Index to the X-Men (Marvel, 1987 series) #5 (March 1988)
in El Asombroso Hombre Araña Presenta (Novedades, 1988 series) #47 (Marzo 9 de 1989)
in Marvel Masterworks (Marvel, 1987 series) #11 ([November] 1989)
in Essential X-Men (Marvel, 1996 series) #1 (1996)
in X-Men : l'intégrale (Panini France, 2003 series) #1975-1976 (décembre 2003)
in Marvel Masterworks: The Uncanny X-Men (Marvel, 2009 series) #1 (2011 [second printing])
in Marvel Gold. La Imposible Patrulla-X (Panini España, 2011 series) #1 - Segunda Génesis (Abril 2011)
in Classic X-Men (Marvel, 1986 series) #8 (April 1987)
in El Asombroso Hombre Araña Presenta (Novedades, 1988 series) #47 (Marzo 9 de 1989)
in L' Uomo Ragno (Edizioni Star Comics, 1987 series) #68 (15 Marzo 1991) [pp. 12, 15]
in Marvel Masterworks (Marvel, 1987 series) #11 ([November] 1989)
in L' Uomo Ragno (Edizioni Star Comics, 1987 series) #68 (15 Marzo 1991)
in X-Men Classic (Marvel Italia, 1995 series) #3 (Dicembre 1995)
in Essential X-Men (Marvel, 1996 series) #1 (1996)
in X-Men : l'intégrale (Panini France, 2003 series) #1975-1976 (décembre 2003)
in Marvel Masterworks: The Uncanny X-Men (Marvel, 2009 series) #1 (2011 [second printing])
in Marvel Gold. La Imposible Patrulla-X (Panini España, 2011 series) #1 - Segunda Génesis (Abril 2011)1st Fastball Special