Threshing with modern machinery in Manitoba, Canada
Unknown author<span style="display: none;">Unknown author</span>
before 1921 <div style="display: none;">date QS:P,+1921-00-00T00:00:00Z/7,P1326,+1921-00-00T00:00:00Z/9</div>
300 ppi scan of <a href="//commons.wikimedia.org/wiki/Collier%27s_New_Encyclopedia,_Volume_1" title="Collier's New Encyclopedia, Volume 1">Collier's New Encyclopedia, Volume 1</a> (1921), opposite page 58, panel G.