THE DUTCH TWINS PRIMER. Grade I.
THE DUTCH TWINS Grade III.
THE ESKIMO TWINS. Grade II.
THE JAPANESE TWINS. Grade IV.
THE IRISH TWINS. Grade V.
THE SCOTCH TWINS. Grades V and VI.
THE MEXICAN TWINS. Grade VI.
THE BELGIAN TWINS. Grade VI.
THE FRENCH TWINS. Grade VII.
THE CAVE TWINS. Grade IV.
THE SPARTAN TWINS. Grades V-VI.
Each volume is illustrated by the author
HOUGHTON MIFFLIN COMPANY
BOSTON NEW YORK CHICAGO