> No Black Locust here.  I checked my Peterson Field Guide which shows the range ending southeast of Lake Erie

I expect they are referring to the original range. Black Locust has spread far beyond that and is regarded as an invasive plant pest in many areas. 

See: http://plants.usda.gov/java/profile?symbol=ROPS

They source: Brouillet, L., F. Coursol, and M. Favreau. 2006. VASCAN. The database of Canadian vascular plants.

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