Tio, Marco Antonio. <br/><br/>
Photoperiodic responses of sugar-cane in Puerto Rico 
by Marco Antonio Tio. 
 -  1952. 
 - 84 leaves  ill. 
<br/><br/>Thesis (Ph.D.)--Pennsylvania State College, 1952. 
<br/><br/>Bibliography: leaves 77-84. 
<br/><br/><br/>Photocopy. <br/>Ann Arbor, Mich. <br/>University Microfilms <br/>1983. <br/>21 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sugar cane--Field experiments.--Puerto Rico<br/>Plant photoperiodism.