Proud, Jean Understanding obstetric ultrasound : its use and interpretation / (by) Jean Proud - 2nd ed. - Cheshire : Books for Midwives Press , 1997 - 98 p. : ill. ; 24 cm. ISBN: 1898507600 RM95.51 Subjects--Topical Terms: Ultrsonography, Prenatal National Library of Medicine Call No.: WQ209