How to measure nitrate nitrogen in environmental 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/><label>Subjects--Topical Terms: </label><br/>Nitates--Analysis.<br/>Water--Analysis.