THE DUTCH TWINS AND LITTLE BROTHER. Grade II.
THE FARM TWINS. Grades I-III.
THE ESKIMO TWINS. Grade II.
THE DUTCH TWINS. Grade III.
THE PICKANINNY TWINS. Grades III-IV.
THE CHINESE TWINS. Grades III-IV.
THE JAPANESE TWINS. Grade IV.
THE SWISS TWINS. Grade IV.
THE NORWEGIAN TWINS. Grades IV-V.
THE FILIPINO TWINS. Grade V.