Devonian Times
- Educational site covering the early evolution of tetrapods by focusing on the Late Devonian Red Hill locality in Pennsylvania and its flora and fauna.
- http://www.devoniantimes.org/
Sarcopterygii - A cladistic diagram, with extensive references to scientific papers on the subject. - http://tolweb.org/tree?group=Sarcopterygii&contgroup=Gnathostomata
Palaeozoic Forests - A description of the colonization of the land by vascular plants and the formation of the first forests in the Devonian. - http://www.uni-muenster.de/GeoPalaeontologie/Palaeo/Palbot/ewald.html
The Red Hill Story - A description of this location, with maps showing its position on the Laurussian continent. - http://www.kcsd.k12.pa.us/~renovohp/dig/story/
Devonian Geography - Description and maps of the continents as they existed at the time. - http://vishnu.glg.nau.edu/rcb/Devonian.html
The Devonian - An overview of the period from the UC Berkeley Museum of Paleontology. - http://www.ucmp.berkeley.edu/devonian/devonian.html