Stafford Meadow Brook
... that one company owned 93% of the upper 11.5 square miles (30 km2) of the Stafford Meadow Brook watershed in the 1940s, and another owned most of the upper 75% of the watershed in the 1990s?
... that one company owned 93% of the upper <span about="#mwt25" data-mw='{"parts":[{"template":{"target":{"wt":"convert","href":"./Template:Convert"},"params":{"1":{"wt":"11.5"},"2":{"wt":"sqmi"},"3":{"wt":"km2"}},"i":0}}]}' id="mwA9M" typeof="mw:Transclusion">11.5 square miles (30</span><span about="#mwt25" typeof="mw:Entity"> </span><span about="#mwt25">km</span><sup about="#mwt25">2</sup><span about="#mwt25">)</span> of the <b id="mwA9Q"><a href="./Stafford_Meadow_Brook" id="mwA9U" rel="mw:WikiLink" title="Stafford Meadow Brook">Stafford Meadow Brook</a></b> <a href="./Drainage_basin" id="mwA9Y" rel="mw:WikiLink" title="Drainage basin">watershed</a> in the 1940s, and another owned most of the upper 75% of the watershed in the 1990s?