The Bobbsey twins

1. 

   Book 1

   The Bobbsey Twins

   Laura Lee Hope

2. 

   Book 2

   Bobbsey Twins in the Country, The

   Laura Lee Hope

3. 

   Book 10

   The Bobbsey Twins on Blueberry Island

   Laura Lee Hope

4. 

   The Bobbsey Twins on a Houseboat

   Laura Lee Hope

5. 

   The Bobbsey Twins at the Seashore

   Laura Lee Hope

6. 

   The Bobbsey twins camping out

   Laura Lee Hope

Book data and covers from Open Library (openlibrary.org).