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Rockland County (N.Y.)
New York (State)
Suffern (N.Y.)
Watertown (N.Y.)
Slingerlands (N.Y.)
Riverhead (N.Y.)
Sennett (N.Y.)
Railroads--Grades
Railroads--Maintenance and repair
Plans (orthographic projections)
Maps (documents)
Blueprints
Maintaining infrastructure
Planning construction