sand-shale ratio

Ash sand ratio

Cement sand ratio

cement sand ratio deviation

Cement-sand Ratio

dig out sand to bring down the river be

gravel to sand interface

gravel to sand size ratio

gravel-to-sand median diameter ratio

high sand ratio

intra-sand shale

Iron sand ratio

Sand Ratio

Sand Shale

sand shale interbed

sand—sand juxtaposition

sand-shale boundary

sand-shale in north Shaanxi

sand-shale sequence