Abstract This collection is primarily comprised of manuscripts, and some corresponding published articles/materials, written by Dr. R. Bruce Harley regarding Agua Mansa/La Placita and related New Mexican history, the Catholic Church in southern California, and March Air Force Base, focusing on the area that is now Riverside and San Bernardino Counties. Harley earned his PhD in history from the University of Iowa and spent his career teaching U.S. and world history, eventually becoming the historian...