Show Crop's got it right. That's a seismic crew. They either set off explosives to make a shockwave, or these vibratory trucks, and they have long strings of microphones that look like orange extension cords strung along the ground. It's like echo sounding when ships are looking for submarines, but now they're looking to see what rock formations are underground. Very common in the oil and gas industry, although it is also done by universities or government just to do research on local geology. If it's industry, probably oil, maybe mining, depending on your location.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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