This book investigates the mineral production and directory of mineral producers in California for the year 1934. It serves as a historical record of the state's mining industry during a specific economic period, detailing the output of various minerals and listing the entities involved in their extraction and processing.

This historical document provides a snapshot of California's mineral industry in 1934. Its value lies in its factual compilation of production data and producer listings, serving as a primary source for researchers interested in the economic and industrial history of the state. The book's utility is primarily archival, offering detailed information for a specific year.