Statistics for occurrence #1 of “Dr. Da Costa” in chapter 49 of Adam Badeau, Grant in peace: from Appomattox to Mount McGregor, a personal memoir:

...r he complained constantly of pains in his throat. He had suffered during the summer from the same cause, but paid no attention to the symptoms until toward the end of his stay at Long Branch, when Dr. Da Costa of Philadelphia, who was paying him a call, examined his throat. This gentleman urged General Grant to consult the most eminent physicians immediately on his return to New York. But General Grant...
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