The book Spinning Wool beyond the Basics is by Anne Field. This podcast is a review of the book.
The second edition was published by A & C Black Publishers. It seems to be the same book and information, although I have not seen an actual copy of the book yet. It is shown in this link at Alibris.
I talk about her differentiating between four ways to spin, woolen, semi woolen, worsted, and semi worsted. The preparation of the fiber and the actual way it is spun, determines which type of yarn you are spinning.