00367cam a22000977a 4500008004000000082001800040245010400058260005000162300000900212700004800221180718b1957   xxu||||| |||| 00| 0 eng d  aYA5084x42 Un3  aDirection of research establishments : Proceedingscby National Physical Laboratory, United Kingdom  aLondonbHer Majesty's Stationery Officec1957  av.p.  aUnited Kingdom.National Physical Laboratory