http://memory.loc.gov/learn/lessons/97/conser1/xroads.html
Type of teaching unit: Lesson Plan Time frame: 3-5 days Subject Matter: The Conservation Movement a Crossroads:The Hetch Hetchy Controversy
http://memory.loc.gov/learn/educators/workshop/discover/treas.html
Type of teaching unit: Lesson Plan Time frame: 1 day Subject Matter: Science and Innovation Treasure Hunt
Bridges
Type of teaching unit: Lesson Plan Time frame: 2 day Subject Matter: A Study of Bridges
Windmills Then and Now
Type of teaching unit: Lesson Plan Time frame: 2 day Subject Matter: Windmills Then and Now
http://memory.loc.gov/learn/features/science/flash.html
What in the world is this? Ingenious Inventions Throughout History
http://memory.loc.gov/ammem/award97/icuhtml/aepsp.html
Ecology and the American Environment