agriculture alan lomax american civil war atlantic ocean author black sunday california canada canadian broadcasting corporation causes of the great depression chicago cities in the great depression crop rotation desertification dorothea lange drought dust dust pneumonia dust storm east coast of the united states erosion farm security administration foreclosure great american desert great depression great depression in australia great depression in canada great depression in france great depression in latin america great depression in south africa great depression in the netherlands great depression in the united kingdom great depression in the united states great migration great plains html hail homestead act hugh hammond bennett john steinbeck kansas karen hesse llano estacado malnutrition musician natural resources conservation service natural disaster new deal new england new mexico new york new york city of mice and men ogallala aquifer okie oklahoma oklahoma panhandle out of the dust panhandle pete seeger photographer prairie president of the united states pulitzer prize rain follows the plow rocky mountains saskatchewan shortgrass prairie smoot-hawley tariff act soil conservation south dakota texas the grapes of wrath the north the plow that broke the plains the south timeline of environmental events topsoil toronto united states university of new mexico wikimedia commons woody guthrie world war i