Columbia subject headings:
Aeronautics--Bibliography.
Aeronautics--Congresses.
Aeronautics--Law and legislation--Italy.
Aeronautics--Law and legislation.
Harvard subject headings:
Aeronautics--Bibliography
Aeronautics--Congresses
Aeronautics--Law and legislation
Aeronautics--Law and legislation--Italy
Italy. Laws, statutes, etc.
Law--Italy
Princeton subject headings: