Cuardaigh téarma Béarla nó Gaeilge
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An t-aonad cartlainne is lú nach féidir aon
roinnt intleachtúil eile a dhéanamh air (e.g.
litir, meamram, tuairisc, nó grianghraf), agus a
ndéantar tuairisc ansin air.
The smallest intellectually indivisible archival
unit (e.g., a letter, memorandum, report, or
photograph) which is then described.