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Manuscripts might be deemed “worthy” of this level of description for many reasons: monetary value of items indicate detailed level of control essential, researcher needs, early dates, scarcity of materials, etc ... but usually multiple reasons are indicated. For example, any new Emily Dickinson, Samuel Johnson, or Henry James materials would be cataloged at this level and often materials pre-1800 are handled this way if time allows. The entire finding aid need not be done this way, but a few items within a collection might call for it.
The typical Typical current standards for:
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Letter:
[1=correspondent]. [2=format] letter to [3=recipient]; [4=geographic location], [5=year month day].
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