TY - JOUR T1 - Preservation of Knowledge, Part 1: Paper and Microfilm JF - American Journal of Neuroradiology JO - Am. J. Neuroradiol. DO - 10.3174/ajnr.A1655 AU - M. Castillo Y1 - 2009/05/20 UR - http://www.ajnr.org/content/early/2009/05/20/ajnr.A1655.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -