I was at a show yesterday and bought an old book. It is furnished by International harvester Company and it is titled Repairs Catalog for OLIVER Plows and Cultivators. At the top is a No. 2-OP on it
  It covers walking plows Sulky Plows, Gang Plows, Disk Plows, and Engine Gas Plows.  It is very old, does anyone the approximate time era of it. There is no dates on it what so all.

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