The book says this is from the Coats & Clark Archive so it has an older source also.

Correction to the pattern : The way the pattern is written at page 14, there is no scalloped edge at the end identical to the one at the cast-on edge. Therefore, a correction is required and it makes such a big difference in the look and finishing of this blanket. It should read : Repeat rows 1-6 for the length required, and repeat row 1 only once more, then knit 3 rows, and then cast off using a large needle.