1912. Die Biologie des Inundationsgebietes der unteren Donau und des Donaudeltas. Verhand. VIII. Inter. Zoöl.-Kongresses zu Graz, 1910, pp.163-208.
Description of the biological conditions on the flooded lower Danube and its delta.
Baker, H. B.
1911. Mollusca. pp. 121-176. In A Biological Survey of the Sand Dune Region on the South Shore of Saginaw Bay, Michigan. Ann. Rep. Mich. Board of Geol. and Biol. Survey for 1910. Lansing.
Rather full notes on mollusca, grouped by habitats.
Chapman, F. M.
1909. The Habitat Groups of North American Birds in the American Museum of Natural History. Am. Mus. Nat. His., Guide Leaflet No. 28. pp. 48.
A descriptive illustrated account of the remarkable habitat exhibits in the museum. The most remarkable series of its kind in existence. An excellent example of the educational value of ecological ideas.
Dahl, F.
1896. Vergleichende Untersuchungen über die Lebensweise wirbelloser Aasfresser. Sitzungsber. d. K. Akad. Wissen. Berlin, 1896. I, pp. 17-30.