RT Journal Article SR Electronic T1 Obstetrical chart. JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 59 OP 60 VO 20 IS 96 A1 Seiler, E. R. YR 1970 UL http://bjgp.org/content/20/96/59.abstract AB