00373cam a22000977a 4500008004000000082001800040245010000058260005000158300000900208700005800217180718b1961   xxu||||| |||| 00| 0 eng d  aT2531x42 Un3i  aProductivity in letterpress printingcby Department of Scientific and Industrial Research, U.K.  aLondonbHer Majesty's Stationery Officec1961  a64+p  aU.K. Department of Scientific and Industrial Research