1. Research in using Polyurethane Foam to Mitigate Rock Bolt Installation Difficulties. Issue 52 (December 2018) Authors: George, Benjamin; Pierson, Lawrence; Barrows, Richard Journal: Transportation research record Issue: Volume 2672:Issue 52(2018) Page Start: 307 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗