I would like to comment on the Threshing Folk item by Donald T. Smith from Gage, Oklahoma, that appeared in Friends and Neighbors in the March/April issue.
If the machines are headers, they were not used to windrow the wheat, they were used along with a header barge that the header elevated the wheat into. It was then hauled to a location of the farmer's choice to be stacked in large stacks and later be threshed by the threshing crew. The threshing crew worked their way through the community.
The farmers exchanged labor to cut down on cash outlay. Cash was in very short supply during that time. The header barge was a horse-drawn wagon, or hay rack, that was driven alongside the header, close enough that the wheat fell onto the barge. There were usually a couple of fellows stacking the wheat on the barge so that it would stay on while riding to the stack location. The wheat would then be pitched from the barge onto the stack, where the fellows on the stack moved the wheat around to form a neat, well-formed stack. Stacking was an art, as the stack had to be built and topped out in such a manner that rainwater would run off. This was before combines took over.
Maybe this is more than you wanted to know, but I had to throw in my two cents.