Yearbook of science and future 
/ by Encyclopaedia Britannica 
 - Chicago  Encyclopaedia Britannica, inc. 
 - 448p. 
<br/><br/> Yearbook of science and future: (1975: year-1974); (1974: year-1973); (1972: year-1971); (1971: year-1970); (1976: year-1975, page- 447p.); (1973: year-1972); (1970: year-1969) 
<br/><br/><label>Dewey Class. No.: </label>505  / ENC/Y