Ten favorite unit studies from the archives: 1. The Horse 2. The Oregon Trail 3. Winnie-the-Pooh 4. The Transcontinental Railroad 5. Johann Sebastian Bach: A Unit Study 6. The Iditarod: A Unit Study 7. Laura Ingalls Wilder 8. The Eiffel Tower 9. The Oklahoma Land Rush: A Unit Study 10. Dickens A Christmas Carol: A Unit Study Ready for More? View all of our unit studies! You can also browse our units by date or in chronological order.