These titles are listed as a group, as they were the only issues to feature the title: 

"DC 100 PAGE SUPER SPECTACULAR"

These books are listed with the publisher's month of publication (as we mentioned earlier, the date does not coincide with the actual date that the book arrived on the shelf).  As you browse downward on the list, you will note that the "Issue #" column is left blank on those issues that did not fall within the run of an existing title.  In the letters page of the last issue to feature the original numbering system, E. Nelson Bridwell indicates that the next planned DC 100 Page Super Spectactular would be SHAZAM! - however, when the next issues came out, they had advertisements and there were three titles in one month.