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Bulk Mail Centers (BMCs)
Bulk Mail Centers are highly mechanized mail processing plants that are part of the National Bulk Mail System. These facilities distribute parcel post, media mail, standard mail and periodicals in bulk form.
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Auxilliary Service Facilities (ASFs)
Auxiliary Service Facilities are mechanized facilities that are usually part of a general mail facility that serves as a subordinate mail processing hub for a parent bulk mail center.
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