Statistics for occurrence #1 of “St. Petersburg” in entry alaskan-boundary-the of Harper's Encyclopedia of United States History:

...54° 40″ N., and to the United States and Great Britain to divide that to the south. Great Britain and Russia settled their maritime and territorial differences by a convention signed at St. Petersburg on Feb. 28, 1825. which will hereafter be referred to as the convention of 1825. This convention defines, in Articles III. and IV., the boundary between Alaska and the British possessions as it...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
St. Petersburg (Russia) 226 45 10 5 0 user votes

† 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.