Following is a fantastic email from reader TheGoof, in his own words. Incidentally, it's not easy to find this out using the Play Index--some manual searching is involved.
I was wondering how unusual it was that Curtis Granderson was leading the league in both runs and RBI. It's not horribly uncommon, as I found, 22 times in the NL, twice in the AA and 25 in the AL (six by Ruth in a 10-year span!).
However, leading both leagues in R and RBI is really rare, especially if you aren't Babe Ruth.
These are famous, historic seasons. Only Magee and Mize surprised me. And I think Cobb was the only one to also lead his league in triples that season.
And, once again, just how good was that Ruth guy? Leading both leagues in R and RBI six times in 10 years? Unreal. I mean, he had to compete with Hornsby and Gehrig and plenty of other greats. As a lifelong Yankee fan, I thought I had some sense, but it wasn't until I read a book about the 1918 Red Sox ("The Year the Red Sox Won the Series," a collection of press clippings) that I really got it. They thought of him like we think of Pujols before he even took to the outfield. And then he hit homers...
Anyway, keep up the good work.
Just one things to add--these days, with so many more players in the league, it's even harder to lead all of MLB in both categories. Granderson's gotta be the MVP.