Program: HathiTrust Digital Library

  • Publisher: Dept. of Natural Resources, Illinois State Geological Survey
  • Print ISSN:
  • Electronic ISSN:
  • OCLC Number: 37665550
  • Validation: None
  • Retention: permanent
  • Institution: HathiTrust
  • Facility:
  • OCLC Symbol: HATHI
  • Holdings Format: Print
Materials Archive Action Date of Action Program Status/Note
1987/1988; 1989/1990-1990/1991; 1995/1996:2; 1995/1996:1; 1997-1998; 1995-2000; 2000-2008
committed to retain 2018-04-12 HTDL