Rumsey, Stephen Reed <br/><br/>
An Analysis of proportional reasoning topics in high school chemistry from a cognitive development perspective  [microform] / 
Stephen Reed Rumsey 
 - Ann Arbor, Mich. :  University Microfilms International,  1986 
 - 1 microfilm reel :  positive ;  35 mm. 
<br/><br/> MF 2889 
<br/><br/>Thesis (Ph. D.) - State University of New York at Albany, 1986 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Chemistry--Study and teaching (Secondary)