Description based on: Mar. 2000; title from caption (viewed May 22, 2001).
Latest issue consulted: Dec. 2006.
System Details
Mode of access: Internet from the USGS web site. Address as of 5/22/01: http://minerals.er.usgs.gov/minerals/pubs/commodity/phosphate%5Frock/index.html#mis; current access is available via PURL.
Linking Entry
Beginning with issue for Jan. 2003, issued in online format only.
Summarized by annual with title: Phosphate rock (Annual).