Columbia subject headings:
Aeronautics, Commercial--Law and legislation.
Aeronautics--Law and legislation.
Diederiks-Verschoor, I. H. Philepina (Isabella Henrietta Philepina), 1915-
Harvard subject headings:
Aeronautics, Commercial--Law and legislation
Aeronautics--Law and legislation
Diederiks-Verschoor, I. H. Philepina (Isabella Henrietta Philepina), 1915-
Diederiks-Verschoor, I. H. Philepina, (1915- ) (Isabella Henrietta Philepina)
Princeton subject headings:
Aeronautics, Commercial--Law and legislation.
Aeronautics--Law and legislation.
Diederiks-Verschoor, I. H. Philepina (Isabella Henrietta Philepina), 1915-2017.