RT Journal Article SR Electronic T1 Excretion of Urinary Coproporphyrin in Lead Poisoning. Part 1 and 2 JF British Journal of Industrial Medicine JO Br J Ind Med FD BMJ Publishing Group Ltd SP 198 OP 208 DO 10.1136/oem.14.3.198 VO 14 IS 3 A1 Václav Holeček YR 1957 UL http://oem.bmj.com/content/14/3/198.abstract AB