Aldo Leopold's Shack Made a Landmark

Aldo Leopold, the father of modern scientific conservation, has had his Wisconsin shack named a National Historic Landmark.

Former Secretary of the Interior Dirk Kempthorne made the designation before he left office in December.

Leopold is largely given credit for his contribution to conservation through his leadership and his thoughtful essays in "A Sand County Almanac."

Leopold died at 61 in 1948 just before the book was published.