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Methods of Mailing
There are several methods of mailing printed materials. Booklets and folders can be Printed in such a way that the address can be fixed directly to the piece and it can be self-mailed without an envelope. Or printed material may be inserted into a special permit envelope, a flap of which is removable for: inspection purposes, and mailed, provided it weighs less than two ounces. Both of these methods require special handling and bundling and may lie delayed in delivery.