Seedtime and harvest

"This circular contains maps showing the dates when planting, harvesting and other operations are preformed in the culture of staple crops in different parts of the United States, and also graphs showing the seasonal distribution of labor by 10-day periods on typical farms in several important agricultural regions. The inscriptions under the maps and graphs afford information as to the hours of labor per acre required in growing the staple crops in certain sections of the country."--Page [2].