RT Book, Section A1 Cunningham, F. Gary A1 Leveno, Kenneth J. A1 Bloom, Steven L. A1 Dashe, Jodi S. A1 Hoffman, Barbara L. A1 Casey, Brian M. A1 Spong, Catherine Y. SR Print(0) ID 1160773294 T1 Fetal Imaging T2 Williams Obstetrics, 25e YR 2018 FD 2018 PB McGraw-Hill Education PP New York, NY SN 9781259644320 LK accessmedicine.mhmedical.com/content.aspx?aid=1160773294 RD 2024/03/29 AB After discovery of the Roentgen ray and the demonstration of the various uses to which it might be put, it was thought possible that it might also afford a valuable method of investigating the shape and size of the pelvis.—J. Whitridge Williams (1903)