Whenever educators choose selections for a series of basal reading textbooks, they include some biographies. But they always face a problem of priorities and space. There is only a little room in a basal series for biographical selections but there are many famous people who could be featured, so they have to decide which people get to occupy the limited biographical space.
Lesesne, T. S., & Mountain, L. (1990). Biographies in the Basals: Which People Are Featured?. Reading Horizons, 30 (2). Retrieved from http://scholarworks.wmich.edu/reading_horizons/vol30/iss2/7