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 1850
From History of Ray County, Mo. (1881)
DANIEL T. DUVAL.
Daniel T. Duval is a native of Ray county. He was born in the year 1850, and raised on a farm, and followed that occupation continuously till the spring of 1881, when, after selling his farm, he purchased the saddle and harness stock of J. W. Harrison, of Richmond, and engaged in that trade. He has a commodious store-room, and a full line of everything pertaining to a well appointed saddle and harness shop, and is rapidly building up a large and lucrative business. Mr. Duval is a son of Thomas A. Duval, who came from Virginia, where he was born, to Ray county, Missouri, at an early day. He died in 1864. Daniel T. Duval is a promising young man, active, energetic and attentive to business.
As printed in History of Ray County, Mo. (1881). See the original pages. Wording is the original; obvious scanning errors have been corrected, and a few may remain.
The printed record stops around 1881. We trace your line from there down to you, with every source cited.