McCreary, O.
1909. The Ecological Distribution of the Birds of Isle Royale, Lake Superior. Ann. Rep. Mich. Geol. Surv. for 1908, pp. 81-95.
Habitat preferences of birds.
Morse, A. P.
1904. Researches on North American Acridiidæ. Carnegie Inst., Pub. 18. pp. 55.
Associational groupings of the short-horned grasshoppers, with figures of habitats.
Ruthven, A. G.
1907. A Collection of Reptiles and Amphibians from Southern New Mexico and Arizona. Bull. Amer. Mus. Nat. Hist., Vol. XXIII, pp. 483-603.
Discusses the associations, habitats, and food of the desert species.
Scott, W.