Hyre, R.A. <br/><br/>
The effect of sulfur fungicides on the photosinthesis and respiration of apple leaves / 
by R.A. Hyre 
 - Ithaca, N.Y. :   Cornell University 
 - 40 p. 
<br/><br/><label>LCCN: </label>199133 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Manzana -- enfermedades <br/>Manzana -- fumigación