Hillers.
The Grand Canyon 258 Storm effect from South Rim.
MAPS A.
Map by the U.S.War Department, 1868.

Supplied by the courtesy of General Mackenzie, U.S.A., showing the knowledge of the Colorado River basin just before Major Powell began operations.

The topography above the junction of the Green and Grand is largely pictorial and approximate.

The white space from the San Rafael to the mouth of the Virgin is the unknown country referred to in this volume which was investigated in 1871-72-73.

Preliminary maps B, C, and D at pages 244-46, and 207 respectively, partly give the results of the work which filled in this area.