printed matter

noun

any of various kinds of printed material that qualifies for a special postal rate.
a classification of international mail consisting of such items, including catalogs and circulars.

Origin of printed matter

First recorded in 1875–80

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Mailing these things out by printed-matter, fourth class mail costs 7-1/2 cents.
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Marion Zimmer Bradley