In the 1930's, when many people across the nation were suffering from the devastating drought, John Apperson and his new organization, the Forest Preserve Association, decided to publish a pamphlet to explain the bad agricultural practices that resulted in man-made soil erosion. About 30,000 copies were distributed nationwide.
![Aldo Leopold, Selected Writings on Conservationrsand1/china2017/library/Leopold2.pdfCoon Valley: An Adventure in Cooperative Conservation [1935] Leopold's concern about soil erosion,](https://img.pdfslide.us/doc/110x75/5e38bc8f1ab731142d67aced/aldo-leopold-selected-writings-on-conservation-rsand1china2017library-coon-valley.jpg)
