Disneyland was known to frequently update their 3 reel sets with new issues. And how can you tell? In the bottom right hand corner, there is a capital letter such as a letter A or B or C etc. The corresponding letter appeared on the face of the reel. Collectors know how to match the reels with the jacket covers this way. These are known as “editions.” Some of the “Lands” went up to the letter J. Not all images changed only what was new or what Disney felt needed updating.