From website:

Choose either worsted or heavy weight yarn to design an original sock. The 16 color charts can be mixed and matched. Circular needles and an after thought heel make the construction easy.

SIZE: 15” around, 23” long

YARN: Worsted weight or heavy weight, 100gms of main color, 50 gms of 2 contrasting colors

NEEDLES: 16” circular sz 8 (worsted) or sz 9 (heavy)

Similar patterns also by Nancy Lindberg:
Christmas Socks is an older pamphlet version of this design. Mix-and-Match Socks are in a book and the directions are presented in a different format.