and when the ice melted on Walden Pond. Some 160 years later, Richard Primack, a biologist at Boston University, is using Thoreau’s handwritten data to track how the climate has changed in this ...

Thoreau spent alone in a secluded cabin at Walden Pond. This edition--introduced by noted American ... definitive text of the original. Introduced by American poet and literary critic Robert ...

Henry David Thoreau, Walden SUSAN BROUGH has come to the woods in Concord because she wishes to swim deliberately. With broad ...