Statistics for occurrence #1 of “Philadelphia, Pa.” in entry felton-samuel-morse of Harper's Encyclopedia of United States History:

...defeated a deep-laid plot to capture the President-elect. When communication through Baltimore was impossible (in April, 1861), he devised a plan for transporting troops via Annapolis. He died in Philadelphia, Pa. , Jan. 24, 1889.
...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  

† 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.