Can't find data/billboard-by_week/billboard-XX.csv

[kneoyskw]

In Chapter 6 Data Assembly of the Second Edition,
6.3 Observational Units Across Multiple Tables, (pp.154-160),
the example scripts uses:
data/billboard-by_week/billboard-XX.csv
but I couldn't find the folder (and csv files) in the data section of the repository.

[anqima-ai]

I can't find it either.