Wayside School

1. 

   Book 2

   Wayside School is Falling Down (Wayside School #2)

   Louis Sachar

2. 

   Book 3

   Wayside School Gets a Little Stranger (Wayside School #3)

   Louis Sachar

3. 

   Book 4

   Wayside School Beneath the Cloud of Doom (Wayside School #4)

   Louis Sachar

4. 

   Sideways Stories from Wayside School

   Louis Sachar

5. 

   Sideways Arithmetic from Wayside School (Wayside School #2.5)

   Louis Sachar

6. 

   More Sideways Arithmetic from Wayside School (Wayside School #2.75)

   Louis Sachar

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