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Provocations #179: Twenty two million year old astrobleme

Published 1987
Contributors: “...Roberts, Walter (author)...”

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Provocations #131: Arctic permafrost and the Greenhouse Effect

Published 1986
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3

Provocations #9: The amazing and portentous summer of 1783

Published 1984
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Provocations #106: 115 years of acid rain records

Published 1986
Contributors: “...Roberts, Walter (author)...”

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5

Provocations #268: A sudden climate warming 10,720 years ago

Published 1989
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Provocations #134: Meteorites on the Antarctic ice

Published 1986
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7

Provocations #168: The ozone hole in Antarctica

Published 1987
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8

Provocations #142: The Arctic

Published 1987
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9

Provocations #137: Mysterious plumes in the Soviet arctic

Published 1986
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Provocations #286: Greenhouse warming and the Arctic

Published 1989
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11

Provocations #180: Dinosaurs in the Alaskan Arctic

Published 1987
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12

Provocations #10: US/USSR bi-national research zone in the Bering Strait

Published 1984
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13

Provocations #154: Diverting the Ob' River

Published 1987
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Provocations #297: A bi-national research park in the Berling Strait

Published 1990
Contributors: “...Roberts, Walter (author)...”

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Provocations #204: The Antarctic ozone hole

Published 1988
Contributors: “...Roberts, Walter (author)...”

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16

Provocations #189: The largest ice sheet on Earth

Published 1987
Contributors: “...Roberts, Walter (author)...”

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