The OC stands for old cemetery. The cemetery is divided by a railroad. West of the railroad is the new cemetery and has the main entrance with the Jesus statue. You want the east entrance, closer to Main St. There's a handrawn map on the Calvary web site that shows the sections. There's only one M section I see. As far as lot 18 #1, I don't know that set up. We just searched section until we found all we were looking for
Sorry I go to my uncles only been taking care of his grave for 30 years
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