00271nam a2200109Ia 4500008004100000041000800041082001900049100001900068245003400087260003200121300000800153211209s1991    xx            000 0 und d  aeng  a720.28 N91 BUR  aBURDEN, ERNEST  aPERSPECTIVE GRID SOURCE BOOK   aNEWYORKbVAN NOSTRANDc1991  a190