Author

Der-Shing Helmer

3 titles available
Cover of The Kung Fu Puzzle Manga Math Mysteries by Der-Shing Helmer

The Kung Fu Puzzle Manga Math Mysteries
Cover of The Great Space Case A Mystery About Astronomy by Der-Shing Helmer

The Great Space Case A Mystery About Astronomy
Cover of Summer Camp Science Mysteries A Mystery About Astronomy by Der-Shing Helmer

Summer Camp Science Mysteries A Mystery About Astronomy

About Der-Shing Helmer

Free ebooks by Der-Shing Helmer available for download.