Davenport, C. B.
1904. Statistical Variation with Special Reference to Biological Variation. Second, Revised Edition. pp. 223. New York.
Forbes, S. A.
1907. An Ornithological Cross-Section of Illinois in Autumn. Bull. Ill. State Lab. Nat. His., Vol. VII, pp. 305-335.
1908. The Mid-Summer Bird Life of Illinois: A Statistical Study. Amer. Nat., Vol. XLII, pp. 505-519.
Flahault, C., and Schröter, C.
1910. Phytogeographical Nomenclature. Reports and Propositions, IIIᵉ Cong. Inter. de Bot. 1910. Bruxelles. pp. 28. Zurich.
A very valuable discussion of ecological nomenclature for plants. Defines the use of such terms as biology, ecology, habitat, association, formation, etc. It is very desirable that the plant and animal ecologists coöperate as much as possible in this subject.
Gibson, W. H.
1905. Camp Life in the Woods and the Tricks of Trapping and Trap Making. pp. 300. New York.