Mills of Humboldt County, 1910-1945 - Hardcoverby Susan J. P. O'Hara (Author), Alex Service (Author), Fortuna Depot Museum (Author) Sequoia sempervirens, California coastal redwood, was Humboldt Countya (TM)s economic mainstay from the 1850s onwards. By the early 20th century, harvesting a oered golda was the major industry along Californiaa (TM)s North Coast, with Humboldt at the forefront of the industry. The first half of the 20th century saw technological changes in logging and milling. New