Source material or symbolic sources are objects meant to communicate information, either publicly or privately, to some person, known or unknown. Typical symbolic sources include written documents such as letters, notes, receipts, ledgers, manuscripts, reports, or public signage, or graphic art, etc. Symbolic sources exclude, for example, bits of broken pottery or scraps of food excavated from a midden—and this regardless of how much information can be extracted from an ancient trash heap, or how little can be extracted from a written document.
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