කුමාර, බී.එම්.ඒ. රාජා
නොපෙනෙන මහා බලවේගයක සැඟවුන රහස් Nopenena mahaa balawegayaka sangawuna rahas = Hidden secrets of an invisible great force - [s.n] [s.l] [2017] - iv, 275p. : ill.(some col.), photos.(some col.), tables
9789553556509
TRANSPORT SERVICES
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656:338.47 / K8
නොපෙනෙන මහා බලවේගයක සැඟවුන රහස් Nopenena mahaa balawegayaka sangawuna rahas = Hidden secrets of an invisible great force - [s.n] [s.l] [2017] - iv, 275p. : ill.(some col.), photos.(some col.), tables
9789553556509
TRANSPORT SERVICES
TRANSPORT ISSUES
TRANSPORT SERVICE PLANNING
TRANSPORT POLICY
656:338.47 / K8