Microfilm Wheaton Public Library holds Chicago suburban telephone directories in microfilm format for years 1920-1972. Also in microfilm, the library holds the U.S. Agricultural Census for DuPage County for years 1850-1880. Agricultural schedules of 1850, 1860, and 1870 provide the name of owner or manager, number of improved and unimproved acres, and the cash value of the farm. The schedules also indicate the number of horses, mules, "milch cows," working oxen, other cattle, sheep, and swine owned by the farmer. The 1880 schedules provide additional details, such as the amount of acreage used for each kind of crop, the number of poultry, and the number of eggs produced.