An advertisement for “Book Vol. 18” can be found in the Popular Needlework Magazine Volume 3, Number 8 dated March 1969 page 55 available for $1.25 cash mailed to her daughter Delina Gilmer.
In a Popular Needlework August 1966 article, Let’s Crochet by Elizabeth Hiddleson she writes, Then, in the future, likely in 1967, I hope to work out my #16 book, which will include several of the bead doilies.