Books by Paul Thomas Gilbert
Bertram and his marvelous adventures
Bertram and the ticklish rhino
Bertram and the ticklish rhinoceros
Egbert and his marvelous adven
Egbert and his marvelous adventures
Bertram's trip to the North po
Bertram's trip to the North pole
Bertram and his Funny Animals
Bertram and his Funny Animals
The key to culture