Here is a partial listing of trail links. I will add more as time permits.
AllTrails.com (look up/find trails)
American Trails (find trails in your state)
Trail Link (look up trails)
Ride This Bike (North American Trails)
Wikipedia List of Cycleways (international)(trails & routes)
Wikipedia List of Rail Trails (international)
Miami Valley Bike Trails (southwestern Ohio)
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