The National Archives/SVAR and The Research Archives in Umeå, "The Swedish Census 1890 County of Norrbotten", database, The Research Archives Umeå University Library (http://www.foark.umu.se/census/bd/personal.asp?lannr=25&forsnr=1&pnr=3317 : accessed 31 Aug 2012), entry for Johan Otto, born 1889; citing SVARvolume 000395, Card nr 2, Page 67, Row 14.