An amendment to Cattle Ranching in Arizona 1540-1950. This document, prepared by William S. Collins, Ph.D., "provides a concise history of modem cattle ranching in Arizona, placing it within the national context of the meat-producing industry during the twentieth century, while identifying the unique attributes of the business as it has endured in Arizona’s peculiar environment".

From Section E, Page 2:

The twenty-five year period covered by this MPDF, from 1945-1970, saw remarkable changes in the character of American agriculture. Among these was an increase in the rate of productivity unprecedented in history of farming and ranching. At the same time, the social character of farm organization and its contribution to American society shifted as the proportion of the population engaged in farming fell to less than two percent of the total.

E.1 Purpose and Organization E.2 Major Economic Trends in American Agriculture In the E.3 Twentieth Century E.4 Agricultural Legislation and Policies in the Twentieth Century E.9 The National Market Structure in the Meat Industry, 1945-1980 E.13 Postwar Adjustments in Arizona’s Ranch Economy, 1945-1952 E.37 Years of Challenge, 1953-1958 E.49 Rationalizing the Ranch, 1958-1970 E.64 Contemporary Cattle Ranching in Arizona, 1970-Present F.68 Property Types G.91 Geographical Data H.92 Summary of Identification and Evaluation Methods I.93 Major Bibliographic References

Source: PDF from The National Archives Catalog. The PDF above is the approved document from the National Archives - a 'clean' copy without stamps/signatures is available here from the [Arizona State Historic Preservation Office Historic Context Studies] (https://azstateparks.com/shpo-historic-context-studies).