Elementary and Secondary school science teachers interested in swapping rocks, minerals, and other earth science materials are hereby notified that a clearinghouse for earth science materials exchange has been established in Arlington Heights, Illinois.
Iowa Science Teachers' Journal
© Copyright 1969 by the Iowa Academy of Science
"Rock and Mineral Exchange Service,"
Iowa Science Teachers Journal: Vol. 7
, Article 4.
Available at: https://scholarworks.uni.edu/istj/vol7/iss1/4