2001, William A. Hustrulid, W. A. Hustrulid, Richard C. Bullock, Underground Mining Methods: Engineering Fundamentals and International Case Studies, SME (→ISBN), page 177:
Equipping a stope for mining at the completion of ledging is a most time-consuming process. The standard of stope equipping and installation of equipment determines the ultimate productivity of the stope. In the normal equipping process, the ...
2009, Mahmoud Torabinejad, Richard E. Walton, Endodontics: Principles and Practice, Elsevier Health Sciences (→ISBN), page 330:
Length
Longer canals are more prone to ledging than shorter canals. Careful attention to maintaining patency is required to prevent ledging.
Initial Size
Smaller-diameter canals are more easily ledged than larger-diameter canals. In summary ...
2017, Kaplan, NBDE Part II Lecture Notes, Simon and Schuster (→ISBN), page 20:
Ledging is an artificial irregularity iatrogenically created on the surface of the root canal wall that impedes instrumentation to the apex of a normally patent and accessible canal. Ledging may occur at the canalorifice or farther apically, and ...