This is a great find! Perhaps a bit "new" for some, but a great tool for placing your family in a certain place at a certain date.
These transcriptions were taken from a Northwestern Bell Telephone Company Telephone Directory for Ogallala, Brule, and Big Springs that was put out in June, 1948 (no copyright). I hope you enjoy this neat item as much as I did.
I should note to the researcher that there are paid advertisements as we might think of them now, that are on each page of the directory, and additionally, all businesses are listed within the regular "white pages."