\magnification=1200 \hsize=4in \overfullrule=0pt \input amssym %\def\frac#1 #2 {{#1\over #2}} \def\emph#1{{\it #1}} \def\em{\it} \nopagenumbers \noindent % % {\bf A. E. Brouwer} % % \medskip \noindent % % {\bf Small Integral Trees} % % \vskip 5mm \noindent % % % % We give a table with all integral trees on at most 50 vertices, and characterize integral trees with a single eigenvalue 0. \bye .