http://www.cdc.gov/nchs

This is the site of the National Center for Health Statistics (NCHS), the agency that collects vital statistics from states and other local units of governments in the United States.

http://www.chinaembassy.ee/eng/ztlm/zfbps/t112910.htm

This site is posted by the Embassy of China in Estonia. It provides a detailed description of China's family-planning policy.

http://www.cnn.com/2014/02/17/health/record-ivf-use/

At this site you will find CNN's coverage on in-vitro fertilization, which is gaining popularity in the United States.

http://www.hormonalforecaster.com/

This site, maintained by a private organization, Clocking Edge, provides information for effective family planning, especially the "rhythm" method.

http://vault.sierraclub.org/planet/200604/familyplanning.asp

This is a family-planning site maintained by the Sierra Club.

http://www.fas.org/sgp/crs/misc/RS20301.pdf

This essay provides a detailed description of various teenage-pregnancy-prevention programs in the United States.

http://www.ippf.org/our-work/where-we-work

This site provides a comprehensive discussion of the International Planned Parenthood Federation and its goals and programs.