00286nam a2200121 a 450000500170000002000150001708200130003210000170004524500310006226000340009330000240012763000130015120251202164133.0  a063113994X  a111bLEW  aLewis, David  aOn the plurality of worlds  aOxfordbBasil Blackwellc1986  ax,276p.c22 cm.bHB  aOntology