[Baseball Rarities]

What are the best websites for doing research in regards to late 19th century and early 20th century newspapers? I am mostly looking for New York newspapers, but would also like access to as many other local newspapers where Major League baseball was played - National Association, American Association, American League, National League, etc., which are generally the larger cities of the time.

I do not mind paying for a subscription if it makes sense.

Thanks in advance, Kevin