https://tile.loc.gov/storage-services/service/gdc/gdcustel/us/te/le/di/re/c0/03/49/usteledirec00349/usteledirec00349.pdf
1979 - 7 digit telephone numbers for emergencies
1983 - 911 and 7 digit telephone numbers for emergency telephone numbers
this is from the library of congress - surely they have more telephone
books like this
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