Social life and customs Solitude Authors, American Homes and haunts Natural history Wilderness areas Government, Resistance to Description and travel Biography Civil disobedience Authors, American--19th century--Biography Mountains Natural history--Massachusetts--Walden Woods Wilderness areas--Massachusetts--Walden Woods American literature Antislavery movements Authors Authorship Concord River (Mass.) Correspondence, reminiscences, etc Description and travel Education Government, residence to Government, resistance to Landscape Massachusetts Merrimack River (N.H. and Mass.) Nature Philosophy Rivers