It has all the states that had primaries, and the numbers match the numbers in Congressional Quarterlies Presidential Elections. An oddity is that PBS has the states ordered by postal code (NC before NE, and MA before MD).
It is interesting that many of the candidates were write-ins. In NH, Muskie, McGovern, Yorty, and Hartke were regular candidates, while Mills, Kennedy, Humphrey, Jackson, and Wallace were write-ins. Only Muskie and McCarthy were on the Illinois ballot. Wallace was a write-in in California.