Someone asked that I post a summary of responses to my request for info 
about where to find a RHWO near Baltimore.  Here it is.  Sorry to say that 
nobody had any suggestions for Baltimore County, but some of the spots 
that were recommended were within a 60-90 minute drive.

- The closest and most promising seems to be McKee Beshers WMA, aka Hughes
   Hollow, and vicinity, near Poolesville.  RHWO were seen there about a
   week ago.

- Calvert Cliffs State Park in southern MD, which had previously been
   reported on this list.

- Jug Bay Wetlands in the same area as Calvert.

- Sky Meadows State park in VA.

- Confederate Ave on the Gettysburg Battlefield in PA.

Thanks again to all who responded.  I hope to find time to get to Hughes 
Hollow while I'm in MD.

Dave Hanscom