Documentary film can encompass anything from Robert Flaherty's pioneering ethnography Nanook of the North to Michael Moore's anti-Iraq War polemic Fahrenheit 9/11, from Dziga Vertov's artful Soviet propaganda piece Man with a Movie Camera to Luc Jacquet's heart-tugging wildlife epic March of the Penguins. In this concise, crisply written guide, Patricia Aufderheide takes readers along the diverse paths of documentary history and charts the lively,...