Sandstone fragments with alveolar deterioration
Sandstone fragments and analysis samples for Bethesda Terrace
12 sandstone coupons with grouting
Microsamples and salt tests from Dakota Sandstone
Stone cubes used for experiment “Porosity of Solids”
Sandstone cubes and thick sections
Marble and sandstone fragments with mechanical pinning.
Photographic film and thin sections of sandstone coupons
