In addition to collecting all the Topps sets, up through 1994 I also tried to collect any test or insert sets Topps put out in each year. I recently made the unexpected addition to my Topps 1970 Booklet set below, an unopened pack. There were a bunch of 1970 extra Topps stuff...Posters, Supers, Candy Lids, Booklets, Scratch Offs ( which differ from the 1971 Scratch Off set only in having white versus red interiors on the inside score card), and then the enigmatic unissued 70 Cloths
Not sure if these first two below are 1970, or issued later.
The 70 Cloth above is my only one, and I owe it to the generosity of Bob, aka Bobsbbcards. It was a never issued set and there are very few examples and a likely incomplete checklist