%%
%% The LaTeX Companion, 2ed (second printing August 2004)
%%
%% Example A-2-14 on page 866.
%%
%% Copyright (C) 2004 Frank Mittelbach, Michel Goossens,
%%    Johannes Braams, David Carlisle, and Chris Rowley
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3
%% of this license or (at your option) any later version.
%%
%% See http://www.latex-project.org/lppl.txt for details.
%%

\documentclass{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{183.0pt}
\StartShownPreambleCommands
\usepackage{calc}
\StopShownPreambleCommands
\begin{document}
xx \fbox{\parbox[b][\height+\baselineskip][s]
         {20mm}{Some text on top. \par\vfill
                And a few lines on the
                bottom of the box.}}
   \fbox{\parbox[b][\height+\baselineskip][s]
         {20mm}{This time a few lines on the
                top of the box. But only one
                line \par\vfill down here.}} xx
\end{document}