6. Descriptions of the Collections between 1920 and 1925. Labor strikes and the environmental degradation which had turned the Southern Plains into the "Dust Bowl," diminished the American cotton industry in the 1920s, though cotton remained an important crop in Arizona. Migrant laborers who worked the fields became the targets of Federal quota acts and the newly formed Border Patrol. Overworked and destitute farm workers from Texas, Oklahoma and Arkansas passed through Arizona on their way to California, many staying a season or two to work in the fields. The literature of the day reveals that dust, drought, and their effects left an indelible mark on Arizona's agricultural, rural, ecological, social, and political landscape. Arizona's economy was severely affected during the Depression. But with the advent of World War II it experienced a revival that lasted for decades. Copper was needed for munitions and machinery, and there was a demand for beef, hides, and cotton. Air bases were built to train pilots year round in the clear desert air. After the end of the War, the state saw a phenomenal amount of growth in population and new industry. With the advent of refrigerated railway cars, much of the acreage that had once been planted in cotton was converted to crops, such as lettuce, alfalfa, vegetables, and citrus. This in turn increased the demand for water--the wild card in Arizona's landscape. The history of Arizona and its agriculture revolve around water control. The Hohokam tried to control water with their sophisticated canals and so did the Mormons. However, it was not until the 1900s that Arizonans adopted a philosophy of domesticating water. This philosophy ushered in a profound new relationship between Arizonans and the federal government. The literature surrounding the construction of the Salt River Project, Roosevelt Dam, and the Central Arizona Project--all huge waterworks programs- -document the solidification of an uneasy relationship between the federal government, Arizona agriculture businesses, and the ever-growing multi-national corporations. The history of these projects is key to understanding Arizona agricultural and rural history. Real estate replaced cattle and cotton as the new speculative product in the last part of the 20th century. Subdivisions displace ranches, orchards, and fields. Undaunted by desert temperatures and shaky foundations, developers have moved into rural areas to plant golf courses and build air conditioned homes. Land fraud, always a problem in Arizona, became epidemic in the 1970s and 1980s. The expansion of urban centers into rural land has been accompanied by air pollution, traffic congestion, and competing water demands to meet residential, industrial and agricultural needs. Arizona's economic base changed from the Four Cs (cattle, cotton, citrus, copper) to service industries and high tech manufacturing in the electronics and aerospace fields. Farmers continue to fight to protect their land and water rights as Arizona becomes more and more urban. Agriculture, however, continues to play a key role in the state's economy even as Arizona once again transforms itself. The history of cattle and cotton in Arizona is well represented in the collections of University of Arizona Library. Candidates for preservation include state and federal documents concerning Arizona water and agriculture issues. Descriptions of the Arizona found in publications such as the Journal of Arizona History (1960--) include overviews of Arizona's agricultural and rural history. The literature that makes up the history of Arizona's agricultural and rural life reflect the forces and activities that helped to forge Arizona's path to its present status. Since printing did not begin in Arizona until 1860, written accounts by explorers, missionaries, settlers, entrepreneurs, and businesses were sent out of the territory to be printed. Many accounts by ranchers and merchants are still in their original hand writing. Publications of the Santa Fe and Southern Pacific Railroads make up part of the literature, as do agencies such as the Commission of Agriculture and Horticulture, the Colorado River Commission, the Crop Improvement Association, the Farm Bureau Federation, and the Pimacotton Growers Association. The University of Arizona and the Agricultural Extension Commission produced, and still produce, a vast number of publications.