Columbia subject headings:
Lazio (Italy)--Antiquities--Guidebooks.
Via Ostiense (Italy)--Tours.
Via Portuense (Italy)--Tours.
Harvard subject headings:
Lazio (Italy)--Antiquities--Guidebooks.
Roads, Roman--Italy--Lazio--Guidebooks.
Via Ostiense (Italy)--Tours.
Via Portuense (Italy)--Tours.
Princeton subject headings:
Guidebooks.
Lazio (Italy)--Antiquities, Roman--Guidebooks.
Roads, Roman--Italy--Lazio--Guidebooks.
Via Ostiense (Italy)--Guidebooks.
Via Portuense (Italy)--Guidebooks.