This collection contains publications, papers, correspondence, teaching files, research files, and professional and personal files. These files give greater background into the work and life of George H. Hargreaves. He dedicated countless hours to researching and improving irrigation techniques and formulas. His research in irrigation provides understanding to the workings of water resources, crop coefficients, and evapotranspiration methods in the United States and abroad. This data can be used to research his estimates and analysis of the cause and effect of irrigation, allowing for further development of resources and techniques for irrigated agriculture.