Statistics for occurrence #1 of “San Francisco, Cal.” in entry attu of Harper's Encyclopedia of United States History:

...strict"> One of the Aleutian Islands, the most westerly point of the United States. It lies 400 miles from Kamchatka. Calling Attu the western extremity of the United States. the city of San Francisco, Cal. , is near the middle of its geographical extent east and west, the territories of the United States stretching through 120 degrees of longitude.
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† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.