Statistics for occurrence #1 of “Seven Pines” in chapter 3 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 9: Poetry and Eloquence.:

... Seven Pines
Federal barracks at New Berne, North Carolina, 1862 Stedman's stirring poem was suggested by a newspap...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Seven Pines (West Virginia, United States) 627 6 21 0 0 user votes
Seven Pines (Mississippi, United States) 85 4 3 0 0 user votes
Seven Pines (Pennsylvania, United States) 16 0 0 0 0 user votes
Seven Pines (Alabama, United States) 4 0 0 0 0 user votes
Seven Pines (California, United States) 0 0 0 0 0 user votes
Seven Pines (California, United States) 0 0 0 0 0 user votes
Seven Pines (Texas, United States) 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.