Relief shown by hachures and spot heights. Shows drainage, township lines, some section lines, ranchos, voting precincts, supervisor districts, railroads, etc. Covers also Imperial County In upper margin: "Voting precincts;" in lower margin: "Supervisor districts." Scale [ca. 1:680,000] (W 117?36?--W 114?27?/N 33?31?--N 32?32?).
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