International Society for Twin Studies
Aims to further research and public education in all fields related to twins and twin studies.
www.ists.qimr.edu.au
Australian Twin Registry
National registry of twin pairs who are willing to consider participating in health related research.
www.twins.org.au
Salt Lake Mothers of Twins
Local support group for mothers of twins, triplets, and more.
www.angelfire.com/ut/slmot
Illinois Organization of Mothers of Twins Clubs, Inc.
Nonprofit group which provides support services, education, and information to Illinois families of twins and higher order multiples.
www.geocities.com/Athens/Aegean/5498/index.htm
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