From the book:

Materials

• Coats & Clark’s Red Heart Wintuk, 4 Ply (“Tangle-Proof” Pull-Out Skeins): 48 ounces of any color.
• Circular Needle, No. 10, 36-inch length

Afghan Measures 57 x 67 inches.

GAUGE
1 scallop (24 sts) = 5 1/2 inches
12 rows = 2 1/2 inches

Be sure to check your gauge before starting afghan. Use any size needle which will obtain the stitch gauge above.

A circular needle is recommended to accomodate a greater number of stitches. Do not join, work in ROWS.