@base . a , ; "Historical methods" . , ; "Historical methods." ; ; ; ; ; ; ; "Historical methods." , "Historical methods" ; ; "http://heldref.metapress.com/openurl.asp?genre=journal&issn=0161-5440" . a . . a ; "0161-5440" ; . a ; . "District of Columbia" . a ; "20230621123152.584449"^^ ; ; .