00313nam a2200109 a 450000500170000002000150001708200130003210000220004524500880006726000280015530000200018320251203110246.0  a0415096057  a192bRUS  aRussell, Bertrand  aOur knowledge of the external worldbas a field for scientific method in philosophy  aLondonbRoutledgec2000  a251p.c22cm.PB.