A study of variations in the frequency of twin births by race and socio-economic status.

Primary biases in twin studies; a review of prenatal and natal difference-producing factors in monozygotic pairs.

1950 • 192 citations

The incidence of multiple births in man and some of the other unipara.

1953 • 64 citations

MONOZYGOTIC AND DIZYGOTIC TWIN BIRTH FREQUENCIES IN THE TOTAL, THE "WHITE" AND THE "COLORED" U.S. POPULATIONS

1946 • 33 citations

HUMAN TWINNING IN THE UNITED STATES: RACIAL FREQUENCIES, SEX RATIOS, AND GEOGRAPHICAL VARIATIONS

1935 • 18 citations