Why is it that the number of at-bats needed to reach 3,000 hits is unknown for certain batters?
In this list: 3,000 Hits Club | Baseball Almanac
There are some batters from the earlier part of the last century, such as Ty Cobb , for who it appears that the number of at -bats that were needed to reach 3,000 hits is unknown. Why is that? It seems we know their other stats very well, so why would this stat be unknown?