Ngā kaupapa kua tūtohitia
- Shipping 6 ngā hua
- Postal service 3 ngā hua
- Airports 2 ngā hua
- Auditing 2 ngā hua
- History 2 ngā hua
- Aeronautics 1 ngā hua
- Communication systems 1 ngā hua
- Design and construction 1 ngā hua
- Economic aspects 1 ngā hua
- Harbors 1 ngā hua
- Highway planning 1 ngā hua
- Mail steamers 1 ngā hua
- Meteorology 1 ngā hua
- Postage stamps 1 ngā hua
- Public broadcasting 1 ngā hua
- Radio broadcasting 1 ngā hua
- Roads 1 ngā hua
- Telecommunication 1 ngā hua