Small collection of lantern slides of early oil drilling activity in the Four Corners area, mostly taken in the San Juan River basin area of Utah east of Mexican Hat. Al Williams had an photography establishment at 964 Market Street in San Francisco that produced hand-colored lantern slides in the early 1900s. He was involved in the early motion picture business before 1906 in San Francisco. These slides were taken in Utah about 1910, when the area was experiencing a boom of oil exploration. The area has continued to been a major producer of oil and natural gas since the early 1900s.