| title | creator | language | description | tableOfContents | contributor | subject | created |
| The Belgian Twins | Perkins, Lucy Fitch, 1865-1937 | en | | | | Twins -- Juvenile fiction; Belgium -- Fiction; World War, 1914-1918 -- Juvenile fiction | 2003-01-01 |
| The Cave Twins | Perkins, Lucy Fitch, 1865-1937 | en | | | | Cave dwellers -- Juvenile fiction; Twins -- Juvenile fiction | 2009-03-28 |
| The Dutch Twins | Perkins, Lucy Fitch, 1865-1937 | en | | | | Twins -- Juvenile fiction; Netherlands -- Fiction | 2003-05-01 |
| The Eskimo Twins | Perkins, Lucy Fitch, 1865-1937 | en | | | | Eskimos -- Juvenile fiction; Twins -- Juvenile fiction | 2003-02-01 |
| The French Twins | Perkins, Lucy Fitch, 1865-1937 | en | | | | World War, 1914-1918 -- France -- Juvenile fiction; Twins -- Juvenile fiction | 2003-05-01 |
| The Irish Twins | Perkins, Lucy Fitch, 1865-1937 | en | | | | Twins -- Juvenile fiction; Ireland -- Juvenile fiction | 2009-03-29 |
| The Italian Twins | Perkins, Lucy Fitch, 1865-1937 | en | | | | Italy -- Juvenile fiction; Twins -- Juvenile fiction | 2009-03-28 |
| The Mexican Twins | Perkins, Lucy Fitch, 1865-1937 | en | | | | Twins -- Juvenile fiction; Mexico -- Juvenile fiction | 2009-05-20 |
| The Puritan Twins | Perkins, Lucy Fitch, 1865-1937 | en | | | | | 2005-09-04 |
| The Scotch Twins | Perkins, Lucy Fitch, 1865-1937 | en | | | | Twins -- Juvenile fiction; Scotland -- Juvenile fiction | 2003-05-01 |