The product is a 1958 USGS California Map titled “Engineering Geology of Islais Creek Basin San Francisco.” This geological map, part of the Miscellaneous Geologic Investigations Map I – 264 series, was authored by Dorothy H. Radbruch and Julius Schlocker. It focuses on the geology of the Islais Creek Basin in San Francisco, California, providing valuable insights for engineering and geological purposes. This wall map, published by the USGS, is a valuable resource for those interested in the geology of California and the United States in general.