Statistics for occurrence #1 of “Heidelberg” in chapter 2, page 21 of Elizabeth Cary Agassiz, Louis Agassiz: his life and correspondence, third edition:

...
have amused him. We slept on the ground on some straw, and returned to Heidelberg the next day in time for dinner. The following day we went to Mannheim to visit the theatre. It is very handsome and well appointed, and we were fortunate in happening upon an excellent opera. ...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Heidelberg (Baden-Wurttemberg, Germany) 301 88 1 0 0 user votes
Heidelberg (Canada) 0 0 0 0 0 user votes
Heidelberg (Kentucky, United States) 0 0 0 0 0 user votes
Heidelberg (Minnesota, United States) 0 0 0 0 0 user votes
Heidelberg (Mississippi, United States) 0 0 0 0 0 user votes
Heidelberg (Pennsylvania, United States) 0 0 0 0 0 user votes
Heidelberg (South Africa) 0 0 0 0 0 user votes
Heidelberg (South Africa) 0 0 0 0 0 user votes
Heidelberg (Texas, United States) 0 0 0 0 0 user votes
Heidelberg (Victoria, Australia) 0 0 0 0 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.