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The AAPT ComPADRE Digital Library is a network of free online resource collections supporting faculty, students, and teachers in Physics and Astronomy Education
MERLOT is a free and open online community of resources designed primarily for faculty, staff and students of higher education from around the world to share their learning materials and pedagogy.
Sponsored by NASA's Exploration Systems Mission Directorate and the Texas Space Grant Consortium, this site "exists to disseminate curriculum materials to interested faculty..