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2. Chromosome studies in selected spontaneous abortions. I. Conception after oral contraceptives;Carr;Can. Med. Ass. J.,1970
3. Shift of childbirth to younger mothers, and its effects on the incidence of mongolism in Victoria, Australia, 1939-1964;Collmann;J. Mental Deficiency Res.,1969
4. A cytogenetic study of human spontaneous abortions using handing techniques;Creasy;Hum. Genet.,1976