PERSON@1 -LRB- `` The Festivals '' -RRB- , NUMBER@1 books extant , about the first semester of the year , about the MISC@1 calendar .

PERSON@1 -LRB- `` The Festivals '' -RRB- , NUMBER@1 books extant which cover the first NUMBER@1 months of the year , providing unique information on the MISC@1 calendar .
