In September I went back to Pennsylvania and drove by what used to be our old farm and saw that at least one of the ancient rock fences is still there. When I was growing up there in the 50s every field was surrounded by these fences. About 30 years ago people began selling the fences - big demand for those rocks on in Japan, I was told.
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My siblings and I with one of the fences. Date is at the top of the photo:
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I'd hate to estimate how many tons of rock we gathered from those fields in the years I lived there!