Marietta Pallis
... that aquatic botanist Marietta Pallis studied the floating reed systems of the Danube Delta?
... that aquatic botanist <b id="mwC_8"><a href="./Marietta_Pallis" id="mwDAA" rel="mw:WikiLink" title="Marietta Pallis">Marietta Pallis</a></b> studied the floating reed systems of the <a href="./Danube_Delta" id="mwDAE" rel="mw:WikiLink" title="Danube Delta">Danube Delta</a>?