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1015 Thirty-first St acid rain acres Alaska American animals Antarctica areas Battlefield Big Bend bill birds California Cave Colorado Congress Conservation Association conservationists cougar Crater Lake Director Earth Day Earth Day 1990 ecosystem environment environmental Everglades federal Florida Florida panther forests frogs funds Glacier Grand Canyon groups Guide habitat hiking historic impacts Island issues Lake land lion LWCF March for Parks Marjory Stoneman Douglas MasterCard ment Mexico miles million mountain bikes National Monument National Park Service National Park System natural North NPCA NPCA's officials P.O. Box Park Education Center park's Parks and Conservation percent photographs plants pollution preserve President Pritchard protect rangers Recreation recycling regional River road ROBERT CAHN Rocky Mountain scenic Senate Send snowmobile species Stephen Tyng Mather tion tional Park tour trail Utah visitors Washington wild wilderness wildlife winter Yellowstone Yosemite