Wikipedia: Callender, Iowa - Encyclopedia article covers geography and demographics of this community in Webster County. - http://en.wikipedia.org/wiki/Callender,_Iowa
City-Data.com: Callender, Iowa - Profiles housing, population demographics, jobs, weather and climate tables. Contains a list of area hospitals, schools, airports, radio and TV broadcast stations, charts and maps. - http://www.city-data.com/city/Callender-Iowa.html
Kraymer.com - Includes galleries of photos taken by Kelly Raymer in June, 2000. - http://www.kraymer.com/