Merrill, Richard J.
The CHEM study story / Ricahrd J. Merrill, David W. Ridgway. - San Francisco : W.H. Freeman, c1969. - vii, 162 p. : ill.
68-9537
Chemistry--Study and teaching (Secondary)--United States.
The Chemical Education Material Study (CHEM).
The CHEM study story / Ricahrd J. Merrill, David W. Ridgway. - San Francisco : W.H. Freeman, c1969. - vii, 162 p. : ill.
68-9537
Chemistry--Study and teaching (Secondary)--United States.
The Chemical Education Material Study (CHEM).