I suspect P76 means barbed wire. Most land parcels in SD used to have either 3-4 strand barbed wire around them. A lot fewer (mostly for those who had sheep) had "woven wire", a strand of barbed uptop and then a wire "panel" so the sheep couldn't crawl under them. I personally like hunting antelope in such pastures as they develop crawl under spots and act as a funnel (antelope won't even jump over the multi-strand barbed wire fence but perfer to crawl underneath).
Anyway, sorry for the off-tangent, but you start roping off 40, 80, 160 (or more) acres in individual parcels and there is a lot of steel wire strung. Even crop fields had such fencing because they tended to graze the stubble fields after harvest, especially corn, with cattle and sometimes hogs. Fast forward to today. A lot more cash grain farmers who have no need for miles of barbed wired fencing so the old fences come down and got rolled up, waiting for...??? Even now, a lot of expedient "pasture" is created by doing one strand of hot-wire electric than keeping a permanent fence.
As P76 alluded to, many, many tons of rolled up rusty old barbed wire fences are laying rolled up in many shelter belts or other "idle" land spots waiting for...??? The vast majority will never be used again.
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