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Tongue and groove router bits are common for thinner stock, e.g., 3/4in - 1 1/4in.

If you are willing to make two passes, then you can use a dado, or rabbit bit to make half the tongue, flip the board and make the other half.
 

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Senior Member
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The wood isn't going to be all the exact same thickness, though. We're talking turn-of-the-20th century sawmill technology. Cutting a dado groove centered would mean microadjusting the fence for each piece. Ideally I'd like to plane the thin edges first, cut the tongues and grooves, glue it into a giant sheet and then plane the whole thing as one piece. This ought to cancel out the slight variances.
You have so much thickness to work with, if I were doing this I would rip each piece to be straight, then plane all the boards to the same thickness.
 
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