„Cyrus Hall McCormick”. Wisconsin Historical Society. Архивирано из оригинала 5. 9. 2007. г. „Cyrus H. McCormick (1808–1883) was an industrialist and inventor of the first commercially successful reaper, a horse-drawn machine to harvest wheat. He was born at the family farm (Walnut Grove) in Rockbridge County, Virginia on February 15, 1809. His father experimented with a design for a mechanical reaper from around the time of Cyrus' birth.”
„Cyrus Hall McCormick”. Wisconsin Historical Society. Архивирано из оригинала 5. 9. 2007. г. „Cyrus H. McCormick (1808–1883) was an industrialist and inventor of the first commercially successful reaper, a horse-drawn machine to harvest wheat. He was born at the family farm (Walnut Grove) in Rockbridge County, Virginia on February 15, 1809. His father experimented with a design for a mechanical reaper from around the time of Cyrus' birth.”
