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www.audubon.org | ||
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www.thenatureofthings.blog
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| | | | | A roundup of the week's news of birds and the environment : The American Bird Conservancy's Bird of the Week is the Broad-winged Hawk. T... | |
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www.charitynavigator.org
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| | | | | National Audubon Society has earned a 4/4 Star rating on Charity Navigator. This Charitable Organization is headquartered in New York, NY. | |
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americanhistory.si.edu
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ptolemy2.wordpress.com
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| | | Phil Salmon Abstract The End-Permian-Triassic extinction (EPTE) is the largest mass extinction in the history of the Phanerozoic - the period of time after the Cambrian 540 million years ago in which multicellular (metazoan) lifeforms have covered the earth. As many as 90% of all metazoan species on land and sea became extinct in this... | ||
