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By law, letter carriers must deliver library materials. They are not required to pick up machines. If you have any problem, please talk with your carrier.Should the problem continue, call your postmaster and refer to Section 135 of the Postal Manual, based on Public Law 91-375, which provides the rules and regulations that govern items mailed as Free Matter. Library materials returned to CTBL are excluded from the weight restrictions established by the post office for placement in street corner mailboxes. USPS receives money in their Federal budget to cover the costs of delivery.