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21
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22ā- Cairney, P. T. (Peter T.)Ngā marau “...Speed limits South Australia Unley Public opinion....”
I whakaputaina 1993
Pukapuka -
23ā- Jenkins, Stephen E.Ngā marau “...Traffic signs and signals Australia Testing....”
I whakaputaina 1992
Pukapuka -
24
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