Adventures of the northwoods

1. 

   Book 2

   The hidden message

   Lois Walfrid Johnson

2. 

   Book 3

   The creeping shadows

   Lois Walfrid Johnson

3. 

   Book 4

   The vanishing footprints

   Lois Walfrid Johnson

4. 

   Book 5

   Trouble at Wild River

   Lois Walfrid Johnson

5. 

   Book 6

   Mysterious hideaway

   Lois Walfrid Johnson

6. 

   Book 7

   Grandpa's stolen treasure

   Lois Walfrid Johnson

7. 

   Book 8

   The runaway clown

   Lois Walfrid Johnson

8. 

   Book 9

   Mystery of the missing map

   Lois Walfrid Johnson

9. 

   Book 10

   Disaster on Windy Hill

   Lois Walfrid Johnson

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