Download or read book Backfilling Problem in the Anthracite Region as it Relates to Conservation of Anthracite and Prevention of Subsidence written by Simon Harry Ash and published by . This book was released on 1946 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Federal participation in a cooperative "backfilling" program to prevent surface cave-ins in the anthracite region of Pennsylvania is recommended in this report, which describes a plan for filling worked-out underground areas with waste or other material. Presents the various systems of backfilling and the technical problems involved. Bibliography included