1.

図書
図書
1. Researches on the constitution of coal
by S. Roy Illingworth
出版情報: London : Colliery Guardian, [19--]
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2.

図書
図書
2. The analysis of coal and its by-products
by S. Roy Illingworth ; assisted by Jenkyn Griffiths ; with a foreword by Robert Robertson
出版情報: London : Colliery Guardian, [1921]
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