Los Angeles County's San Gabriel Valley and the adjacent Inland Empire, encompassing San Bernardino and Riverside Counties, boasted a wealth of movie theatres throughout the 20th century. ? Entertainment options proliferated as people flocked to both areas, which were famed for their wealth-producing citrus groves and vineyards, their position along Route 66, and their mountain and desert resorts. Residents and vacationers could enjoy films at nickelodeons, picture palaces, drive-ins, and other venues; some still operate. Due to the regions' proximity to Hollywood and their more rural and suburban settings, local cinemas frequently held studios' test screenings (including for Gone with the Wind and The Wizard of Oz); audiences there thus influenced what moviegoers elsewhere watched. Film exhibition's history there reflects cultural, social, and demographic trends in these areas and the United States. Kelli Shapiro, PhD, is a public historian and preservationist who has lived in both regions. She holds degrees from Pomona College, Texas State University, and Brown University. She wrote the Los Angeles Conservancy's successful California Register of Historical Resources nomination for Route 66's Azusa Foothill Drive-in Theatre--as well as Historic Movie Theatres of West Virginia, another Images of America book. This book's images came from multiple museums, archives, and collections.