A Connection Between Perfect Matchings and Spanning Trees of Planar Graphs

<p>
The text, 
<a href="http://jamespropp.org/temperley/text.ps.gz">
gzipped</a>
or
<a href="http://jamespropp.org/temperley/text.ps">
not</a>

<p>
<a href="http://jamespropp.org/temperley/figure1.ps">
Figure 1</a>

<p>
<a href="http://jamespropp.org/temperley/figure2.ps">
Figure 2</a>