Bonnie Lee Hill has spent a considerable amount of time studying and trading commodities. She runs a popular website with links to various resources including Astroeconomics. She is well known for having given an excellent lecture on W.D. Gann’s famous book, The Tunnel Through the Air (TTTA). In this lecture, Bonne Lee Hill breaks down various passages in the TTTA book into understandable, bite sized lessons on W.D. Gann’s underlying trading techniques.