I am searching for information on my ggg-grandfather:
John Brown ALLISON
b. 20 Sep 1828 in BOONE CO, MO
d. 08 Mar 1904 in STURGEON, BOONE CO, MO

His wife, my ggg-grandmother:
Elizabeth Mosby WOODSON
b. Dec 1826 in VA
d. 19 Feb 1924 in Dallas, TX

J.B. ALLISON m. E.M. WOODSON: 14 Nov 1850 in MO

My gggg-grandfather:
Alexander ALLISON
b. 07 Jun 1802 in PA
d. 13 Oct 1861 in MARIES, MO

And my gggg-grandmother:
Jemima CRAWFORD
b. 1811 in VA
d. 1836 in BOONE CO, MO

A. ALLISON m. J. CRAWFORD: 27 Sep 1825 in BOONE CO, MO

I'm mainly looking for Alexander ALLISON and Jemima CRAWFORD. I can't seem to find out who they are or where they came from.

Any help would be most appreciated.