=001 1000000028 =033 0#$a1502$801 =040 ##$aAuArU$beng =240 10$aEton Choirbook$017 =245 10$aEton Choirbook =300 ##$amanuscript of polyphony, i + 128 + i$bparchment$c595 x 425 mm$801 =774 18$w1000000490 =852 ##$aGB-ETc$cMS 178$eEton College Library$x101