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Watersheds : a practical handbook for healthy water /
by Beck, Gregor Gilpin,
Publication:
Willowdale, Ont. : Firefly Books, 1999
. 152 p. :
26 cm.
Date:1999
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Water pollution /
by Stille, Darlene R.
Publication:
Chicago : Childrens Press, 1990
. 46 p. :
, Includes index.
23 cm.
Date:1990
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Our endangered planet.
by Hoff, Mary King.
Publication:
Minneapolis : Lerner Publications Co., 1991
. 64 p. :
, Includes index.
21 x 23 cm.
Date:1991
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Our endangered planet: Rivers and lakes /
by Hoff, Mary King.
Publication:
Minneapolis : Lerner Publications Co., 1991
. 64 p. :
, Includes index.
21 x 23 cm.
Date:1991
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(1),
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