原文 (英语)

Lucy Fitch Perkins ILLUSTRATED BY THE AUTHOR BOSTON NEW YORK CHICAGO HOUGHTON MIFFLIN COMPANY The Riverside Press Cambridge Geographical Series 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. Histori