Henry David Thoreau 
A Week on the Concord and Merrimack Rivers [EPUB ebook] 

A Week on the Concord and Merrimack Rivers is both a remembrance of an intensely spiritual moment in Henry David Thoreau’s life and a memoriam to his older brother who accompanied him on the trip shortly before his death. Full of fascinating literary musings and philosophical speculations, this book is a true precursor to Walden.