00461nam a22001937a 450000500170000001000110001702000100002803700160003804000120005408200110006610000170007724500460009426000270014027000310016730000210019865000230021965000220024270000030026420170124110123.0  a998474  c00.00  bCen Lib/Ret  aDPLbEN  aNbTRE  aTrew, Antony  aTwo hours to darkness /cby  Antony  Trew  aLondonbCollins c1963  aSt. James,s Place bLondon  a320p. c18cm(Hb)  aNuclear submarines  aPolaris (Missile)