Benton, William.
Britannica Yearbook of Science and the Future / - First Ed. / - Chicago : Encyclopaedia Britannica, Inc.. - p.800 :
0-85229-168-X
n56,L68 / L2
Britannica Yearbook of Science and the Future / - First Ed. / - Chicago : Encyclopaedia Britannica, Inc.. - p.800 :
0-85229-168-X
n56,L68 / L2