In coal, the trend is the key
Year of publication: |
1977
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Authors: | Shirk, Gertrude |
Published in: |
Cycles : official bulletin of the Foundation for the Study of Cycles. - Pittsburgh, Pa. : [Verlag nicht ermittelbar], ISSN 0011-4294, ZDB-ID 862346-6. - Vol. 28.1977, 2, p. 37-42
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Subject: | Kohlenstatistik | Vereinigte Staaten |
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