eco-timeline By mers21 Period: Apr 28, 1948 to Oct 28, 1972 Federal Water (Clean Water) Act of 1948 Sep 27, 1962 Rachel Carson's Silent Spring Period: Nov 22, 1963 to Dec 31, 1968 President Lyndon Johnson signed into law almost 300 conservation and beautification measures most significant was the Wilderness Act of 1964 Sep 3, 1964 Wilderness Act of 1964
