able>

<h2><a id="P">-- P --</a></h2>

<table style="width: 100%;">
<tr><td style="width: 25%;"><a href="PlantGrowth.html">PlantGrowth</a></td>
<td>Results from an Experiment on Plant Growth</td></tr>
<tr><td style="width: 25%;"><a href="precip.html">precip</a></td>
<td>Annual Precipitation in US Cities</td></tr>
<tr><td style="width: 25%;"><a href="presidents.html">presidents</a></td>
<td>Quarterly Approval Ratings of US Presidents</td></tr>
<tr><td style="width: 25%;"><a href="pressure.html">pressure</a><