The development of a classroom observation instrument relevant to the earth science curriculum project

1971 ◽  
Vol 8 (3) ◽  
pp. 231-235 ◽  
Author(s):  
John P. Smith
Weatherwise ◽  
1964 ◽  
Vol 17 (3) ◽  
pp. 120-121
Author(s):  
Robert L. Heller

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