1. Aviation charts. San Francisco, Calif. Humboldt Bay, Calif.; aviation chart V-418. Scale 10 naut. m.=1.5 in., 10 stat. m.=1.3 in., natural scale 1:500,000 at lat. 39° 05′. Bookmark Corporate/Agency Authors: Hydrographic Office Publisher: Hydrographic Office Date: published June, 1929, 2d edition, June, 1931 SuDoc number: N 8.27:V-418/2