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1. Secular trends and latitude gradients in sex ratios at birth in Czechoslovakia and the post-Czechoslovakian States

2. Secular trends and latitude gradients in sex ratios at birth in the former Soviet Republics

3. Secular trends and latitude gradients in the male-female ratio at birth in Yugoslavia and the ex-Yugoslavian States

4. The Chernobyl accident, the male to female ratio at birth and birth rates