Georg Eckert Institute for International Textbook Research, Braunschweig, Germany
The Georg Eckert Institute is a research institute on teaching materials in the fields of history, geography, and social studies. It has an impressive international textbook collection.
Selected Finding Aids and Collections by Nancy O'Brien, University of Illinois at Urbana-Champaign (June 10, 2002)
Les manuels scolaires québécois, Textbooks in Québec, Canada (Université Laval)
African Colonial Schoolbooks Project, Centre Aequatoria at Bamanya/Mbandaka, Democratic Republic of the Congo
Vestfold University College (Norway) has two sites explicitly devoted to textbooks and research on textbooks (1), (2)
El Proyecto MANES tiene como objetivo principal la investigación de los manuales escolares producidos en España, Portugal y América Latina durante los siglos XIX y X, Universidad Nacional de Educación a Distancia (España).
The following site contains a curious collection of digitized books relating to (largely U.S.) education. It includes an interesting collection on 19th century books on teaching and curriculum as well as university histories and primary sources.
One-room schools: Bibiography. A presentation of the Clarke Historical Library, Central Michigan University
IARTEM: The International Association for Research on Textbooks and Educational Media
SHARP: Society for the History of Authorship, Reading & Publishing
Images of digitized textbooks, letters books, etc.
19th Century Schoolbooks: Digital editions of schoolbooks in the Nietz Old Textbook Collection, University of Pittsburgh, USA.
De Umistelige Bøger (Høgskolan i Vestfold, Norway: Norwegian letter books).
German Emblem Books (University of Illinois at Urbana-Champaign, USA: a searchable collection of German emblem books).
Juxtalinéaires textes classiques grecs et latins édités chez Hachette au XIXe siècle