I have asked this question here once before and have since forgot the answer....I promise to remember this time! In the late 80's there was a commercial on TV for a reading program for children that came packaged in a green bus. The commerical featured characters riding in the green bus and delivering the set to your door. I believe the program involved using cards that were stored in the bus. I believe the word "pickle" may have been in he title-- as well, this program may have had a connection to Captain Kangaroo.?