RT Journal Article SR Electronic T1 Preservation of Knowledge, Part 1: Paper and Microfilm JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology DO 10.3174/ajnr.A1655 A1 M. Castillo YR 2009 UL http://www.ajnr.org/content/early/2009/05/20/ajnr.A1655.abstract AB