In the book's own words, not ours, with obvious scanning errors fixed. Families often supplied these stories to the publisher, so check key dates.
Born 1841, Richland county
From History of Johnson County, Iowa, containing a history of the county, and its townships, cities and villages from 1836 to 1882. Together with biographical sketches .. (1883)
JOHN H. CLARK, merchant and stock-dealer, son of Ezekiel Clark; was born in Richland county, Ohio, October 23, 1841, and emigrated to Iowa in 1848, with his parents, and settled in Iowa City; he attended the State University, also Bryant & Stratton's Commercial College, at Chicago. When only twelve years of age he commenced dealing in stock and made a trip to Philadelphia, when at that age, with stock, and has been engaged in that business ever since. At one time he owned 3,200 acres of land, which he kept well stocked with cattle and hogs; he is the oldest shipper in the county. He now owns a general merchandise store at Coralville, where he has lived for the past thirty years, and also owns considerable town property. He was married September 20, 1862, to Miss Mary McCullough, also of Ohio. This union has been blessed with seven children: four now Uving: Hattie B., Ezekiel, Mary S., and Cora C.
As printed in History of Johnson County, Iowa, containing a history of the county, and its townships, cities and villages from 1836 to 1882. Together with biographical sketches .. (1883). See the original pages. Wording is the original; obvious scanning errors have been corrected, and a few may remain.
The printed record stops around 1883. We trace your line from there down to you, with every source cited.