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Twenty Years' Practical Experience of Natural Asphalt and Mineral Bitumen. [With illustrations.]
- "Twenty Years' Practical Experience of Natural Asphalt and Mineral Bitumen. [With illustrations.]"@en
- "Twenty years?practical experience of natural asphalt and mineral bitumen"@en
- "Twenty years' practical experience of natural asphalt and mineral bitumen"
- "Twenty years Ě“practical experience of natural asphalt and mineral bitumen"@en