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Study of quarry costs :trap rock, sandstone, granite

Mineral wool

Prospecting and exploration for sand and gravel

Development of sand and gravel deposits

Sand and gravel excavation.

Sand and gravel excavation.

Sand and gravel excavation.

Sand and gravel excavation.

Sand and gravel excavation.

Published Year

• 1930-1939 (9)

Subject

• Gravel (6)
• Sand (6)
• Excavating machinery (4)
• Mine haulage (2)
• Insulation (Heat) (1)
• Mineral wool (1)
• Mining engineering (1)
• Prospecting--Geophysical methods (1)
• Quarries and quarrying (1)
• Sand and gravel industry (1)
• Sand and gravel mines and mining (1)

Author

• Thoenen, J. R. (9) *

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