1. _The Happy Harper Family Series_ (12 books)
- This series follows the adventures of the Harper family as they travel around California in a covered wagon.
2. _Tales from the Santa Cruz Mountains_ (3 books)
- These stories are set in the Santa Cruz Mountains and feature the adventures of local children.
3. _Stories of the Early Days in California_ (10 books)
- A series that retells the history of California from the early Spanish missions to the Gold Rush.
4. _The Desert People Series_ (4 books)
- This series is about the lives of Native Americans in the deserts of California.
5. _Stories of California Indians_
- A collection of short stories about different California Indian tribes.
6. _California Pioneers and Patriots_
- A book about the early pioneers and patriots who helped shape California's history.
7. _Legends of California Missions_
- A collection of stories and legends about the California missions.
8. _California: Land of Promise and Paradise_
- This book is a comprehensive history of California from its earliest inhabitants to the present.
9. _The Missions of California_
- A book that tells the story of the 21 Spanish missions that were built in California.
10. _The Spanish Explorers_
- This book tells the stories of the Spanish explorers who came to California in the 16th and 17th centuries.