Statistics for occurrence #1 of “northwestern Virginia” in chapter 9, page 156 of Maj. Jed. Hotchkiss, Confederate Military History, a library of Confederate States Military History: Volume 3, Virginia:

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mountain region, the dome of the watersheds of northwestern Virginia , covered by a vast and dense forest of large evergreen trees, reaches an altitude of nearly 5,000 feet, so that, naturally, it is at all times a damp and chilly region having a large rainfall. Duri...
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