Christensen, Halvor N. <br/><br/>
pH and dissociation :  a learning program for students of the biological and medical sciences / 
Halvor N. Christensen. 
 - 2nd ed. 
 - Philadelphia :  W.B. Saunders,  1964. 
 - ix, 107  p. :  ill. ;  26 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Medical science.<br/>Biological science.<br/>Hydrogen-ion concentration.