Genetic variation
Subtitle: an environmental investigation into tongue rolling and other inherited traits : a teacher's preparation
By: edited and published by National Wildlife Federation ; design and illustrations by Jan Blyler.
Contributors: National Wildlife Federation.
Publisher: National Wildlife Federation
Published: 1972
Place of publication: Washington D.C
Language: eng
Notes: "One of a group of Environmental Units written by the Environmental Science Center which is now the environmental education unit of the Minnesota Environmental sciences Foundation, inc." - inside front cover.