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In page National Lampoon (magazine):

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Heavy Metal debuted in the US with an April 1977 issue, as a glossy, full-color monthly published by HM Communications, Inc., a subsidiary of Twenty First Century Communications, Inc.[4] The cover of the initial issue declared itself to be "From the people who bring you the National Lampoon", and the issue primarily featured reprints from Métal hurlant, as well as material from National Lampoon.[5] Since the color pages from Métal hurlant had already been shot in France, the budget to reproduce them in the US version was greatly reduced.[citation needed]