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In the past, I have used splines cut from hardwood. For 3/4 inch
boards I would use a spline tha is 1/4 inch thick by 3/4 inch wide. This puts the spline about 3/8 into each board. I had good luck with it. You can cut the grove with a winged router bit or us a table saw, the cut a spline to fit.
Biscuts pretty much replaced these techniques. The best would probably be a glue joint router bit after jointing the edges.
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