๐๐ข๐
๐ง ๐ญ[๐จ|๐ก|๐ฌ]
๐๏ธ๐๏ธ๐
๐ง ๐๏ธ๐
๐๏ธ๐คซ๐ป
๐๐๏ธ๐
๐๏ธ๐๐ก
๐๏ธ๐๐ป
๐๐ก๐๏ธ
๐โ๏ธโ๏ธ
๐๏ธ๐ก๐
๐ง ยป{โจ}
๐๐๏ธ
๐๏ธโ๏ธ๐ง
#universal decimal classification #UDC #library science #knowledge organization #classification system #bibliography #decimal system #libraries