"Early tugboats were usually referred to as towboats. The Charles P. Greenough, shown here, is obviously not equipped for 'pushing,' as her bow is lightly built and unprotected. The vessel was built in 1913 for the Commercial Towboat Company of Boston, Massachusetts." --Fletcher, David H. "The Portland Company 1846-1982." Charleston, S.C.: Arcadia Pub., 2002. 64.