000 - Computer science, information, general works 45,976 Dangos Cofnodion 020 - Library and information sciences 14,465 Dangos Cofnodion 030 - General encyclopedic works 4,722 Dangos Cofnodion 080 - General collections 4,632 Dangos Cofnodion 070 - Documentary, educational, news media; journalism 3,338 Dangos Cofnodion 050 - General serial publications 2,644 Dangos Cofnodion 060 - General organizations and museology 2,637 Dangos Cofnodion 090 - Manuscripts, rare books 1,694 Dangos Cofnodion 010 - Bibliography 1,601 Dangos Cofnodion 040 - [Unassigned] 134 Dangos Cofnodion 300 - Social sciences 27 Dangos Cofnodion 510 - Mathematics 6 Dangos Cofnodion 650 - Management and auxiliary services 5 Dangos Cofnodion 820 - English & Old English literatures 3 Dangos Cofnodion 330 - Economics 2 Dangos Cofnodion 340 - Law 2 Dangos Cofnodion 620 - Engineering and allied operations 2 Dangos Cofnodion 800 - Literature (Belles-lettres) and rhetoric 2 Dangos Cofnodion 360 - Social problems and services; associations 1 Dangos Cofnodion 370 - Education 1 Dangos Cofnodion 570 - Biology 1 Dangos Cofnodion 740 - Graphic arts and decorative arts 1 Dangos Cofnodion 790 - Recreational and performing arts 1 Dangos Cofnodion 810 - American literature in English 1 Dangos Cofnodion