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Schoolyards have class as outdoor laboratories


Author:
Mergen, K.N. and Thomas, C.H.
Source:
USDA
Year:
1972
Subject:
soil conservation
Format:
p. 257-262. ill.
Language:
English
Collection:
USDA publications
Permanent URL:
http://handle.nal.usda.gov/10113/IND79000691