Page:Compendium of US Copyright Office Practices (1973).pdf/366

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The material to be copied must consist of "official correspondence, including preliminary applications, between copyright claimants or their agents and the Copyright Office" (37 C.F.R. §201.2(c)). Such material includes anything (other than deposit copies) that the applicant sent to the Copyright Office and that became a part of the Correspondence file-including un­registered applications and the file copies of the Office's letters to the applicant. It also includes any mailing wrappers preserved in the correspondence file, and re­turn receipts or similar material furnished by the Post Office or Western Union in