From the book’s description:

In Bartlettyarns 2-ply Fisherman, one 4-oz (114g) skein each of MC and CCa and about 1ox (28.5g) of a third color (CCb) will make two pairs of Woman’s Small mittens or one pair of Man’s Medium and a pair of child’s 2-3 or 6-8. Man’s Large uses most of two skeins.