Title: Qin Han di guo yu Luoma di guo de jiao tong ji she hui bi jiao yan jiu
Subjects: Communication and traffic, History, Economic conditions, Transportation
Places: China, Rome
Time periods: To 1500, To 1644, 30 B.C.-476 A.D., Qin dynasty, 221-207 B.C., Han dynasty, 202 B.C.-220 A.D.