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The Canadian junior green guide /
by Degler, Teri,
Publication:
Toronto : McClelland & Stewart, 1990
. 120 p. :
26 cm.
Date:1990
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Pollution and conservation /
by Penny, Malcolm.
Publication:
Englewood Cliffs, N.J. : Silver Burdett Press, 1989
. p. cm.
, Includes index.
Date:1989
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Our fragile earth
by Helfman, Elizabeth S.
Publication:
New York, Lothrop, Lee & Shepard Co. 1972
. 160 p.
25 cm.
Date:1972
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