In this fourth installment of our six-part series, “Key Records and Repositories,” we dig into the rich and textured history of the Southwestern United States through the lens of mining and agricultural records. These records are not only treasures of historical data but also vital tools for genealogists seeking to unearth the stories of their ancestors in Arizona, California, Colorado, Nevada, New Mexico, and Utah. We will explore the genealogical importance of these records, guiding...