Casper & Nightmare (1964, Harvey)

Casper & Nightmare ran for 41 issues (1964–1974). Publishing format: was ongoing series. Cover title for issues 6-33 is "Casper the Friendly Ghost and Nightmare the Galloping Ghost"; Cover title for issues 34-46 is "The Friendly Ghost Casper and Nightmare the Galloping Ghost". Issues 1-37 in this series have "single copies 25¢, 35¢ in Canada" printed in their indicia. The regular U.S. editions only have a U.S. price of "25¢" printed on the cover, while the Canadian editions only have a Canadian price of "35¢" on the cover. Only U.S. editions exist for issues 38-46.