Check the listing for details. SWITCHED-ON SCHOOLHOUSE HISTORY AND GEOGRAPHY 400 4TH GRADE CURRICULUM DISC. Condition: Very Good. Listed at 19.99 USD. This Switched-On Schoolhouse CD is a great resource for homeschooling families. With a focus on 4th grade curriculum, it includes history and geography lessons that are perfect for this age group. The CD is in English and is compatible with Windows operating systems. It is a retail product and is categorized under Education, Language, Reference, Software, and Computers/Tablets & Networking. The Switched-On Schoolhouse brand is known for its quality educational software, and this CD is no exception. It is perfect for families who want to provide their children with a comprehensive education in a fun and engaging manner. The curriculum disc is a great addition to any homeschooling family's collection and is sure to provide hours of educational entertainment.