One skein of size 30 used in the model in the book. US Size 12 hook.

According to the chart for Daisy thread in the front of Volume 14:
one skein of white size 30 = 500 yards
one skein of colored size 30 = 400 yards

The pattern does not say if she used white or colored thread in her pattern.

Erata:
rnd 2 - There is a typo, the second line should read
2 dtr in nx tr, ch 2, 2 dtr in nx tr, rf, slst last ch

rnd 17 - There is an omission, the first line should read
as 15 to *, one v-sp, 2 blk, p-ch, dtr in nx dtr,

rnd 19 - There is an error, the first line should read
as 15 to *, blk after nx blk, ** p-ch, ch 5,