Statistics for occurrence #1 of “Captain Ely S. Parker” in chapter 2 of John Harrison Wilson, The life of Charles Henry Dana:

...oughness with which he had learned this strange tongue and the tenacity with which he had retained it. Coming into camp one night after a hard day's ride, we found a strange officer at the camp-fire, Captain Ely S. Parker , a full-blooded and well-educated Seneca Indian, who had been recently detailed at headquarters to assist Colonel Rawlins and Captain Bowers in the growing work of the adjutant-general's department....
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