% LaTeX2e source file
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\documentclass[12pt]{letter}
\usepackage{labels}
\LabelGridtrue
\LabelInfotrue
\begin{document}
\normalsize\sf
\numberoflabels=20
\boxedaddresslabel{%
Prof. Grant B. Gustafson\\
Department of Mathematics\\
113 JWB University of Utah \\
SLC, UT 84112\\
}
\end{document}