I realize its been a long time since you posted this message but I just found you. If you haven't already found the answers to your questions I may be able to help. My great-grandmother Laura Mary Plasterer Kann was a sister to your James Buchanan Plasterer I have a list of all their siblings and parents and grandparents back to Heinrich and Anna Maria who arrived in America in 1739....I also have pictures of the tombstones of the earlier generations that are buried at a church in Penryn.....close to where I live ...I have a question for you about James dates I have him as 7/12/1849-12/8/1912 and Mary Catherine Shearer as 8/12/1853-11/16/1894....I also have that They were married 1/25/1875 settled in Shippensburg, Pa. where Mary died. James then moved to Barnes Co. North Dakota, where most of the children settled they had five children, I also have their names and dates.
..............Please email me at firstname.lastname@example.org