Note 4 — Introductory material
Reading edition
O’Brine, D. Progress Bulletin on the Loco and Larkspur. Colo. State Agric. Coll. Bul. 25, p. 18. 1893.
[5] Fletcher, J. Evidence Before the Select Standing Comminttee on Agriculture and Colonization. Ottawas, 1905, p. 53.