▁of ▁D uel ing ," ▁Southern ▁Econom ic ▁Journal ▁ 7 6 , ▁ 4 : 1 0 9 4 - 1 1 0 6 . ▁ ▁News ▁articles ▁ ▁Further ▁reading ▁ ▁References ▁ ▁External ▁links ▁▁ ▁Robert ▁E . ▁Wright , ▁National ▁Bureau ▁of ▁Econom ic ▁Research ▁▁▁ ▁Category : August ana ▁University ▁people ▁Category : L iving ▁people ▁Category : 1 9 6 9 ▁birth s ▁Category : 2 1 st - century ▁American ▁histor ians ▁Category : Pe ople ▁from ▁Ro chester , ▁New ▁York <0x0A> </s> ▁Phoenix ▁Union ▁High ▁School ▁was ▁a ▁high ▁school ▁that ▁formed ▁part ▁of ▁the ▁Phoenix ▁Union ▁High ▁School ▁District ▁in ▁Phoenix , ▁Arizona . ▁ ▁Much ▁of ▁the ▁campus ▁was ▁listed ▁on ▁the ▁National ▁Register ▁of ▁Historic ▁Places ▁in ▁ 1 9 8 2 ▁as ▁Phoenix ▁Union ▁High ▁School ▁Historic ▁District . ▁ ▁History ▁ ▁The ▁school ▁was ▁established ▁in ▁ 1 8 9 5 , ▁before ▁Arizona ' s ▁state hood . ▁It ▁was , ▁for ▁many ▁years , ▁the ▁oldest ▁secondary ▁school ▁west ▁of ▁the ▁Mississippi ▁River . ▁ ▁When ▁P U HS ▁first ▁opened , ▁it ▁had ▁four ▁class room ▁and ▁ 9 0 ▁students , ▁and ▁was ▁located ▁on ▁the ▁second ▁floor ▁of ▁an ▁elementary ▁school . ▁ ▁The ▁three ▁original ▁main ▁buildings , ▁built ▁during ▁ 1 9 1 1 - 1 2 , ▁were ▁designed ▁by ▁Norman ▁F . ▁Marsh . ▁ ▁P U HS ▁was ▁the ▁only ▁high ▁school ▁in ▁the ▁Phoenix ▁Union ▁High ▁School ▁District