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- National Science Foundation (U.S.) (5)
- Association of American Geographers. High School Geography Project (4)
- Bednarz, Sarah Witham (2)
- Kracht, James B. (2)
- Carswell, Ronald J. B. (1)
- Domdey, Günter (1)
- Klimpel, Paul (1)
- Mayes, Mike (1)
- National Council for the Social Studies (1)
- Patton, Donald J. (1)
- Rettke, Hans (1)
- Smalley, Keith (1)
- high school geography project of the Association of American Geographers (1)
- the National Science Foundation (1)
- the high school geography project of the Association of American Geographers (1)