Teacher's Resources from the Library of Congress
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The Library of Congress has helpfully linked primary sources, lesson plans, activities and even professional development for teachers on this page. From here, you can find a wealth of lesson plans, primarily relating to American History, but literature and culture are also well represented. The lesson plans are built around primary sources-- letters, interviews, and other documents from the time in question. They are meaty, in depth lessons, from what I've seen. Most lesson plans are for upper elementary through high school, with a definite bias toward the higher grades.
