The Lynds were only the first to conduct a series of studies in Muncie. The National Science Foundation funded a third major study that resulted in two books by Theodore Caplow, "Middletown Families" (1982) and "All Faithful People" (1983). Caplow returned to Muncie in 1998 to begin another study, Middletown IV, which became part of a Public Broadcasting Service documentary titled "The First Measured Century", released in December 2000. The Ball State Center for Middletown Studies continues to survey and analyze social change in Muncie. A database of Middletown surveys conducted between 1978 and 1997 is available online from the Association of Religion Data Archives (ARDA). Due to the extensive information collected from the Middletown studies during the twentieth century, Muncie is said to be one of the most studied cities of its size in the United States.