1. The green island mystery Title: The green island mystery Date: ©1949. Author: Allen, Betsy, 1909-2001. Collecting Area: Mathes Childrens Literature Call number: YH C377 G7 LOCAL
2. The riddle in red Title: The riddle in red Date: ©1948. Author: Allen, Betsy, 1909-2001. Collecting Area: Mathes Childrens Literature Call number: YH C377 R5 LOCAL
3. The clue in blue, Title: The clue in blue, Date: [1948] Author: Allen, Betsy, 1909-2001. Collecting Area: Mathes Childrens Literature Call number: YH C377 C5 LOCAL
4. Puzzle in purple Title: Puzzle in purple Date: ©1948. Author: Allen, Betsy, 1909-2001. Collecting Area: Mathes Childrens Literature Call number: YH C377 P89 1948 LOCAL