 | Fluorspar Mines of Newfoundland : Their History and the Epidemic of Radiation Lung Cancer Martin John R. : John R. Martin, a retired physician and professor of medicine at Memorial University, was chief occupational medical officer for the Province of Newfoundland (1984-1992).John R. Martin, a retired physician and professor of medicine at Memorial University, was chief occupational medical officer for the Province of Newfoundland (1984-1992). |
