Katherine Dang is one of my favorite BPA teachers. She is so knowledgeable and gentle and kind and, well, wonderful. Her organization is Philomath Foundation and she is available for consultations, conferences and the like. Ms. Dang has been in BPA education for over 30 years. Her wisdom is inspiring and her materials are top-notch. I hope you’ll take time to listen some of her conference audio (her Series on the Introduction to American Christian Education is wonderful. I’ve probably listened to each session a dozen times!) Material from the Wednesday Night Salons she holds in California is also great for sparking discussions in your own small group setting.
Her materials are available here. Dang’s Universal History volumes are excellent texts for high school and beyond. She also offers others materials such as a science project guide and several literature guides on this page.