00390nam a2200121Ia 4500008004100000082002000041100002300061245010000084260003200184300001000216600002200226650002000248140224s9999    xx            000 0 und d  a025.45' .001 K9  aPerreault, Jean M.  aTowards a theory for UDC; essays aimed at structural understanding and operational improvement/  aLondonbClive Bingleyc1969  a241p.  aJean M. Perreault  aLibrary science