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1
Science year : the World Book science annual, 1967
Chicago: World Book-Childcraft International, Inc., 1981
432p. : ill. ;c26cm



2
Science year : the World Book science annual, 1973
Chicago: World Book-Childcraft International, Inc., 1981.
432 p. : ill. ;c26 cm



3
Science year : the World Book science annual, 1980
Chicago : World Book-Childcraft International, Inc., 1981.
432p. : ill. ;c26cm



4
Science year : the World Book science annual, 1982.
Chicago : World Book-Childcraft International, Inc., 1981.
400p. : ill. ;c26cm



5
Science year : the World Book science annual,1966.
Chicago : World Book-Childcraft International, Inc., 1966
443 p. : ill. ; 26 cm