1848 G. Lippard i.10/2 Harry sat in silence on the edge of the Prairie knoll, his slender form couched artlessly on the tall thick grass.
1868 G. A. McCall 418 The abrupt prairie knolls,..seem in the distance to elevate their rocky summits.
1976 95 314 A complex network of interconnected marshes that, together with several low prairie knolls, makes up this state wildlife management area.