Limit on births: abbr.Else clues
• Births = deaths letters
• Census find, perhaps: Abbr.
• Demographer's goal, perhaps: Abbr.
• Fam. planning advocates
• Fam. planning goal
• No. of births = no. of deaths
• Overcrowding antidote, initially
• Result of a balance between the birth and death rates: Abbr.
• Sustainability aim (abbr.)