[en] Milk, animal fodders, soils, humans, livestock, and wildlife on or near 55 dairy farms in Utah were assayed for radionuclide content. Effects of soil chemistry, water supply, plant type, farming practices, geographic location, altitude, rainfall, and other ecological differences were sought by intensive analysis. Although many analyses have not been completed, several cause-effect relationships have been defined. Wet-lands yield more ¹³⁷Cs, ¹³¹I, or ⁹⁰Sr to milk under like conditions of fallout intensity than dry-lands. In most cases, the station with the highest yield is also practicing wet grazing. ⁹⁰Sr and ¹³⁷Cs content of milk is enhanced by sandy soils. Increased altitude and higher rainfall lead to higher yields of ⁹⁰Sr and ¹³⁷Cs in milk. Levels of ¹³⁷Cs in milk increase from south to north, and Utah can be divided into several regions, each having a characteristic level of ⁹⁰Sr and ¹³⁷Cs in milk, meat, and fodders. Poor pastures (over-grazed to the extent that stem bases are eaten and much soil is exposed) yield more ¹³⁷Cs and ⁹⁰Sr than improved pastures. Feeding green chop alfalfa or putting the animals on the meadows causes marked but temporary increases in the ⁹⁰Sr and ¹³⁷Cs content of the milk. However, the annual yield for two stations of similar ecology in the same geographic area is essentially the same. Experimental details are presented in Volume I. The appendices in Volume II are made up primarily of the data compiled at the 78 stations