Henry King Olmsted and George K. Ward, _Genealogy of the Olmsted Family in America_ (1912); digital images, _Google Books _(http://books.google.com : accessed 31 October 2008), page 21-22, entry for John (#66) Olmsted m. (1) Abigail Cone (1725-1782), dau. Stephen and Abigail (Barnes) Cone; John (#66) Olmsted m (2) Ruth Hutchins (1740-1811).
This source can now be viewed at Internet Archive:
John (#66) Olmsted
http://archive.org/stream/cu31924029843244#page/n71/mode/2up
It provides a summary of John Olmsted's children, continuing information (biographies) about sons John Olmsted and Zechariah Olmsted, both of whom married Clark daughters.
Son John (162) Olmsted's profile on p. 30-31, link below. He was a Revolutionary War patriot/pensioner. Text provides for his marriage to Olive Clark, dau. Charles and "Mary" (Brown) Clark. Source provides continuing information (biographies) about several of John's sons, including first born son, Charles Clark Olmsted.
http://archive.org/stream/cu31924029843244#page/n81/mode/2up
Son Zechariah (166) Olmsted's profile on p. 32-33, link follows. He b. 1763, d. 1831. This Zechariah married Elizabeth Clark, the sister of Olive Clark above noted. He was a graduate of Yale; practiced law at Westchester Co., NY. The source provides continuing information (biographies) about several of his children.
http://archive.org/stream/cu31924029843244#page/n83/mode/2up