In Dry Farming in the Northern Great Plains, Mary Hargreaves reviews the changes in agricultural technology and farm management through the 1920s, the introduction of federal programs as drought and depression recurred in the 1930s, and the realignment of
In Dry Farming in the Northern Great Plains, Mary Hargreaves reviews the changes in agricultural technology and farm management through the 1920s, the introduction of federal programs as drought and depression recurred in the 1930s, and the realignment of
描述:在《北部大平原的旱作农业》这本书里，作者回顾了20年代在该地区旱作农业的技术和管理，30年代政府对旱作农业所创立的一些工程以及后来对旱作农业的调整。