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125
"WARMING, E. Plantesamfund. Grundtraek af den okologiske plante-
| geografi. — Kjobenhavn 1895.
——, Oecology of Plants. An introduction to the study of plant-
communities. — Oxford 1909.
—— und GRAEBNER P., Eug. Warmings Lehrbuch der ökologischen
Pflanzengeographie. — Berlin 1918.
"VESTAL, A. G., a, Local distribution of grashoppers in relation to plant
associations. — Biol. Bull., 25, 1913.
—»—, b, An associational study of Illinois Sand Prairie. — Bull. Ill. State
ab, Nat, Bist, 10, 1913,
—»—, a, Internal relations of terrestrial associations. — The American
Naturalist. Vol. XLVIII, New York 1914.
—»—, b, Prairie vegetation of a mountain-front area in Colorado. — The
Botanical Gazette, Vol. LVIII, Chicago 1914.
—»—, Foothills vegetation in the Colorado front range. — Ibid., Vol.
LXIV, Chicago 1917.
—»—, Phytogeography of the eastern mountain-front in Colorado. I.
Physical geography and distribution of vegetation. — Ibid., Vol. LXVIII,
Chicago 1919.
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