How many movies have Len Janson and Peter Wood collaborated on?

They have worked on 1 movie together! Their first movie together was The Hanna-Barbera Hall of Fame: Yabba Dabba Doo II (1979) and was their highest rated movie together. They have not worked together since The Hanna-Barbera Hall of Fame: Yabba Dabba Doo II (1979).