\usepackage[T1]{fontenc}
\usepackage[palatino, helvetica, courier, maths=cmr]{mdwfonts}
-\usepackage[margin=20mm]{geometry}
+
+\hoffset=-1in \oddsidemargin=20mm \evensidemargin=\oddsidemargin
+\textwidth=\paperwidth \advance\textwidth by -2\oddsidemargin
+
+\voffset=-1in \topmargin=20mm \headheight=0mm \headsep=0mm
+\textheight=\paperheight \advance\textheight by -2\topmargin
\newdimen\titlewidth \titlewidth=70mm