Papua New Guinea road classification and design standards : rural roads.

I tiakina i:
Ngā taipitopito rārangi puna kōrero
Kaituhi rangatōpū: Papua New Guinea. Department of Public Works
Hōputu: Pukapuka
I whakaputaina: [Port Moresby] : Dept. of Public Works, 1972.
Ngā marau:
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