The regulations do not specify in what form records must be kept. A method of storage which faithfully reproduces records, like micro fiche recording, would be acceptable so long as means of referencing the information are kept on hand and operational for the entire five year retention period.(8/29/94)

This question and answer was originally posted at Consolidated List of Reformulated Gasoline and Anti-Dumping Questions and Answers: July 1, 1994 through November 10, 1997 (PDF)(333 pp, 18.17 MB, EPA420-R-03-009, July 2003, About PDF)