Phosphorite research and development - Notholt, Arthur John George; Jarvis, Ian (Geological Society, 1990)
"Papers contributed to the 11th and Final International Field Workshop and Symposium of the International Geological Correlation Programme (IGCP) Project 156: Phosphorites, which was held at Hertford College, Oxford, England, 5-8 September, 1988"--P. v.