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IEA Coal Research
> Matthias K Hessling
Matthias K Hessling
title
ISBN-13
(ISBN-10)
year of publication
Mine productivity
978-92-9O29-187-9
(92-9O29-187-7)
1991
K. H.
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M. H.
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M. K.
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Matthias Hessling
Matthias K. Hettl