This is the 1860 census entry, I think:

NARA M-653, Roll 608, 1860 U.S. Census, Boone Co., MO, Perche Township, p. 961, #850/927: Marshall Stevens, 56, m, Farmer, $1800/$600, KY; Mary Ann, 54, f, VA; James H, 23, m, Farmer, MO; Cynthia A, 21, f, MO.

It gives you a variant of the surname for future searching. I've also seen it as Steiwers.

Virginia