Tilas Paper-31 Guld i Boliden Och Olja i Dalarna, From Ny Teknisk Tidskrift (1984:44), Box: 34, Folder: 5. Hollis Hedberg papers, RH MS 546. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/149972 Accessed May 05, 2024.