Parts 11 and 12 are a special-coverage group, restricted to the region of the Lower Colorado River below Grand Canyon. Proceed to the drop-downs from this subtab.
BIBLIOGRAPHICAL AND HISTORICAL RESOURCES IN THE GRAND CANYON AND LOWER COLORADO RIVER REGIONS OF THE UNITED STATES AND MEXICO
Parts 11-12: Separate-Coverage Group: LOWER COLORADO RIVER REGION (BELOW GRAND CANYON) SPECIALIZED MATERIAL
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