Constitutional Rights Foundation
Constitutional Rights Foundation: Rachel Carson and the Environmental Movement [Pdf]
Article with questions for discussion and group activity in which students explore the ideas brought forth by Rachel Carson in her book, Silent Spring.
US Environmental Protection Agency
Epa: The Spirit of the First Earth Day
This article is an in-depth description of the first Earth Day, and includes the impact the demonstration had on the environmental movement.
Other
Center for Ca Studies: California Environmental Goals and Policy, Part I [Pdf]
Although focused primarily on environmental legislation in California in the 1970s, there is a good review of the environmental movement as it was supported nationally. (Published June 1995)