Peter Dale Moore
Aleph Anrep
Unknown Author
M. A. W. Gerding
Jukka Laine
Gerry McNally
Saskmont Engineering
Philip M. Parker
Rovaniemen turveteollisuusseminaari 1977.
International Peat Congress, 3d, Quebec, 1968
University College Dublin. Department of Agricultural and Food Engineering. Mechanisation Systems Research Group.
Edgar Kirke Soper
Reijo Ronkainen
Valerian Aleksandrovich Nikiforov
Eino Lappalainen