Reference citation:
A.C. Twomey. The Bird Population of an Elm-Maple Forest with Special Reference to Aspection, Territorialism, and Coactions. Ecological Monographs, 15(2), pp. 173-205.

Source citation:
Global Web Database (http://globalwebdb.com): an online collection of food webs. Accessed via https://www.globalwebdb.com/Service/DownloadArchive on 2017-10-12.

Source archive URL:
https://github.com/globalbioticinteractions/globalwebdb/archive/12f2c1ad026e634aea47dc40c0a5e9d463165058.zip

Reference citation:
A. C. Twomey, The bird population of an elm-maple forest with special reference to aspection, territorialism, and coactions, Ecol. Monogr. 15(2):175-205, from p. 202 (1945).

Source citation:
Semantic Prototypes in Research Ecoinformatics (SPIRE). Data provided by Joel Sachs. See also http://ebiquity.umbc.edu/get/a/publication/297.pdf .

Source archive URL:
https://github.com/globalbioticinteractions/spire/archive/b2f52536ed93797820e4295fe1097310d37ddbaa.zip