. ▁Early ▁tele phone ▁ex changes ▁were ▁staff ed ▁almost ▁entirely ▁by ▁women , ▁and ▁P ond ▁and ▁P ond ▁believed ▁that ▁a ▁decor ative ▁design ▁would ▁be ▁more ▁inv iting ▁to ▁female ▁workers ▁than ▁a ▁plain ▁and ▁functional ▁building . ▁Major ▁Chicago ▁firm ▁Hol ab ird ▁& ▁Ro che ▁designed ▁three ▁add itions ▁to ▁the ▁building ▁in ▁ 1 9 1 3 , ▁ 1 9 2 8 , ▁and ▁ 1 9 4 8 . ▁The ▁tele phone ▁exchange ▁closed ▁in ▁the ▁ 1 9 6 0 s , ▁and ▁the ▁building ▁was ▁subsequently ▁used ▁by ▁the ▁Wilhelm ▁K . ▁Ro ent gen ▁Element ary ▁School ▁through ▁the ▁ 1 9 9 0 s . ▁ ▁The ▁building ▁was ▁added ▁to ▁the ▁National ▁Register ▁of ▁Historic ▁Places ▁on ▁May ▁ 3 0 , ▁ 2 0 0 1 . ▁ ▁References ▁▁ <0x09> <0x09> ▁Category : Ind ust rial ▁buildings ▁completed ▁in ▁ 1 9 0 7 ▁Category : Ind ust rial ▁buildings ▁and ▁structures ▁on ▁the ▁National ▁Register ▁of ▁Historic ▁Places ▁in ▁Chicago ▁Category : Ne oc lass ical ▁architecture ▁in ▁Illinois ▁Category : Public ▁elementary ▁schools ▁in ▁Chicago ▁Category : T ele phone ▁exchange ▁buildings ▁Category : Form er ▁elementary ▁schools ▁in ▁Illinois <0x0A> </s> ▁The ▁Ess ential ▁English ▁Library ▁is ▁a ▁series ▁of ▁books , ▁some ▁fiction ▁and ▁some ▁non - f iction , ▁intended ▁mainly ▁for ▁foreign ▁students , ▁though ▁it ▁is ▁hoped ▁that ▁English ▁readers ▁may ▁also ▁find ▁them ▁of ▁interest . ▁The ▁fiction ▁has ▁been