Christensen, Halvor N. <br/><br/>
Neutrality control in the living organism :  a learning program for students of the biological and medical sciences / 
[by] Halvor N. Christensen. 
 - Philadelphia :  Saunders,  1971. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Acid-base equilibrium -- Programmed instruction.--Acid-base equilibrium -- Programmed instruction.<br/>Hydrogen-ion concentration -- Programmed instruction.--Hydrogen-ion concentration -- Programmed instruction.<br/>Acid-Base Equilibrium -- Programmed texts--Acid-Base Equilibrium -- Programmed texts<br/>Hydrogen-Ion Concentration -- Programmed texts--Hydrogen-Ion Concentration -- Programmed texts