Once upon a time in Ada
Things you didn’t know about your own hometown
By Lee Crouse
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Here's an important notice from the Ada Post Office from January, 1911:

Patrons of the post office will please observe that the office will not be open on Sunday afternoons hereafter.

Those served by carrier can call for their mail on Sunday morning at the time the office is open by going to the city carriers’ windows and asking them for the mail as they are on duty there and then, the same as the other department of the office. 

And also don’t forget to put a two cent stamp on the drop letters.