00360nam a2200157Ia 4500008004100000020001800041035001000059082001300069100001500082245003300097250000600130260004200136300000800178500001000186650000600196210723s9999||||xx |||||||||||||| ||und||  a0 262 52021 4  a26909  a509BBER  aBernal, J. 0aScience In History  Vol - 2  a-  aCambridgebCambridge University Press  a692  a21015  a-