Lines, Clifford John. <br/><br/>
Teaching environmental studies in the primary and middle school / 
by C.J. Lines [and] L.H. Bolwell. 
 - London :  Ginn & Co.,  [1971] 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Nature study.<br/>Conservation of natural resources -- Study and teaching.--Conservation of natural resources -- Study and teaching.