Lesson Plans and Worksheets for Several Subjects
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Scholastic (covers lesson plans for Language Arts, Social Studies, Math and Science)
Ed Helper (covers all elementary subjects)
School Express (covers all Elementary subjects)
American Teachers (Various lesson plans)
Discovery.com (Lesson plans for many subjects)
Teacher Planet (covers lesson plans on every subject)
First School Years (Lower Elementary)
Homeschooling Adventures (All Grades, Most Subjects)
Learning Horizons (I use their books)
Learning Planet
Smithsonian For Kids
MrDonn.org (resources for every subject)
Homeschooling Adventures (very extensive)