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This morning I removed my comments about Seamhead errors, thinking they might be in poor taste, and I went back to their website to do additional verifications of their rosters against some that I have.
I then checked their home page, and they state that data collected so far is for 1912 on. The 1909-11 data is definitely not complete, and a lot of it has apparently not been verified. For instance, if you are a Kansas City fan, you'll notice that the 1910-11 KC Royal data is basically not there in any usable form.
Since my project is for 1909-11, all data will definitely have to be verified against real box-scores and newspaper accounts. Any of you who are helping out are certainly more than welcome to go to Seamhead for ideas, but unless you have box-scores with first names, the players in the Seamhead team lists could be wrong (generally, correct last name but wrong first name - hence, incorrect player).
Thanks