Statistics for occurrence #1 of “Washington, Oregon” in entry army of Harper's Encyclopedia of United States History:

...wstone National Park), Colorado, and Utah, and the Territories of Arizona and New Mexico: headquarters, Denver, Col. Commander, Brig.-Gen. Henry C. Merriam. Department of the Columbia.--States of Washington, Oregon , Idaho (except so much of the latter as is embraced in the Yellowstone National Park) ; headquarters, Vancouver Barracks, Wash. Commander,------. Department of Cuba.--Consisting of the province...
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