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[Page 18]

[Back of envelope, with the following printed message]
To facilitate the return of undelivered letters, without their being opened, business people and others concerned should endorse the covers of all correspondence posted by them with a special request for its return, in the event of its remaining undelivered at the expiration of a specified period, which must not be less than seven days. In each case the name and full address of the sender should be appended to the request.

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