RT Journal Article SR Electronic T1 A Slide Rule for Haematological Calculations JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 208 OP 209 DO 10.1136/jcp.10.2.208 VO 10 IS 2 A1 J. W. Nicholas YR 1957 UL http://jcp.bmj.com/content/10/2/208.abstract AB