How to measure alkalinity of natural and waste waters  [kit] 

 - 1 sound cassette, 1 film strip, 39 slaids, 1 study guide  in container, 22 X 15 X 5 cm. 
 - Environmental Skills series [kit] .
<br/><br/> copy in VHS format 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hydrogen ion concentration--Measurement.<br/>Water--Analysis.