https://geo.btaa.org/resources/p16022coll247:226
Soil map of Minnesota : showing mean annual rainfall, temperature, and dates of killing frosts -...
Cartographic Details: Scale not given. Copyright: Hudson Publishing Co. "Soil and rainfall data from Prof. N.H. Winchell's 'Atlas of the physical features of...
soil mapkilling frostsminnesotashowingmean