One of the most important resources for baseball researchers, the Lahman database, has been updated with the 2012 Major League Baseball data. It's an amazing compendium, with complete statistics for teams and players from 1871 to 2012.
You can access the dataset (in a variety of formats) here.
And I encourage you to make a financial contribution through the donations page to help support this endeavour.
2018 Mariners Black Friday Gift Guide
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