RT Journal Article
SR Electronic
T1 Changes in the twinning rate in Canada 1926-70.
JF British Journal of Preventive & Social Medicine
JO Br J Prev Soc Med
FD BMJ Publishing Group Ltd
SP 236
OP 241
DO 10.1136/jech.27.4.236
VO 27
IS 4
A1 Elwood, J M
YR 1973
UL http://jech.bmj.com/content/27/4/236.abstract
AB