Indicia details (capitalization in the indicia):
4: BOZO and THE BIG BALLOON
5: BOZO in THE LAND OF FORGOT
6: BOZO VISITS THE SANDMAN'S CASTLE
7: BOZO, featuring Bozo the Capitol Clown
Indicia details and tracking information from Jon Ingersoll via the GCD Error List (October 10, 2010).
Bozo continues as part of Four Color (Dell, 1942 series) #464 (Apr-1953), #508 (Oct-1953), #551 (Apr-1954) & #594 (Oct-1954); with a further revival, Bozo the Clown (Dell, 1962 series) #1-4