PT  - JOURNAL ARTICLE
AU  - Elwood, J M
TI  - Changes in the twinning rate in Canada 1926-70.
AID  - 10.1136/jech.27.4.236
DP  - 1973 Nov 01
TA  - British Journal of Preventive & Social Medicine
PG  - 236--241
VI  - 27
IP  - 4
4099  - http://jech.bmj.com/content/27/4/236.short
4100  - http://jech.bmj.com/content/27/4/236.full
SO  - Br J Prev Soc Med1973 Nov 01; 27