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1nork Blaker, David (David Neville)Gaiak “...Environmental protection Juvenile literature....”
Argitaratua 1994
Liburua -
2nork Donegan, LukeGaiak “...Environmental protection Study and teaching...”
Argitaratua 2001
Liburua -
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7nork Hunt, DavinaGaiak “...Environmental protection Problems, exercises, etc. Juvenile literature....”
Argitaratua 1997
Liburua