Platte River, [184].
Plows, [263].
Polk (County), [243].
Polk, James K., [21], [87], [100].
Pomeroy, Walter, [206], [210].
Porpoise (ship), [195].
Portage, [236].
Porter, J. M. (Secretary of War), [136].
Portland (Ore.), [16], [17], [25], [75], [158], [159], [162], [196], [209], [278], [281], [284], [285].
Portland General Electric Company, [102].