label-pln – Print address labels in three columns
Input may be a set of labels in-line in a document, or a file of labels.
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typeset sets of labels (for cutting out, etc.)
extensions to Plain TeX for higher-level constructs
Maybe you are interested in the following packages as well.
- knuth-letter: Knuth's example letter macros
- list: List ASCII text files
- lettermac: Simple macros for writing letters (Plain TeX)
- histyle: A "HighStyle" environment for TeX