550,240 CHUDLEIGH PATRICIA, PEARCE J. MALCOLM Obstetric ultrasound : how, why and when /Patricia Chudleigh, J. Malcom Pearce ;forew. by Stuart Campbell. - 2 ed.- Edinburgh [etc.] : Churchill Livingstone, 1992. - VIII, 323 s. : il., wykr. ; 25 cm ISBN 0-443-04207-1