The 68 Topps Milton Bradley set is viewed by some as a parallel set and by others as variations to the 68 set. It also is only a partial set. Interestingly two of the MB cards, Cox and Brinkman, have long been viewed as variations to the 68 set ( incorrectly in my view)
There are many views on what is or should be a "variation" but there is no real standard hobby definition or official arbiter of what should be on a set check list. The process has been mostly ad hoc
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