1 Beginning Farmers and Ranchers [科技报告]
作者:Mary Ahearn andDoris Newton
发布日期:2009
关键词:Agricultural statistics;Agricultural Resource Management Survey (ARMS);...
发布机构:United States Department of Agriculture
作者:Edwin Young andC. Tim Osborn
发布日期:1990
关键词:Conservation;soil erosion;...
发布机构:United States Department of Agriculture