Nickelsburg, Janet. <br/><br/>
Field trips :  ecology for youth leaders / 
Janet Nickelsburg. 
 - Minneapolis :  Burgess Pub. Co.,  c1966 [Printing 1971]. 
 - i, 120 p. :  ill. ;  22 cm. 
<br/><br/>Includes Bibliography and Indexes 
<br/><br/><label>ISBN: </label>0808714058 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology.
<br/><br/><label>Dewey Class. No.: </label>577  / NIF 1971