Environmental education : teaching our children to preserve the future : field hearing before the Subcommittee on Early Childhood, Elementary and Secondary Education, Committee on Education and Labor, U.S. House of Representatives, One Hundred Tenth Congress, second session, hearing held in Laurel, MD, April 22, 2008
U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O.,
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