This collection contains several of WD Gann's rarest and most important writings which equally apply to both stock, commodity or Forex markets. First is his most highly sought after course, The Mathematical Formula for Market Predictions, was written later in his career, after 52 years of trading and market experience. This course was lost for 50 years until initially republished here in our collection It provides a mathematical and geometrical techniques for determining and forecasting market structures at the most advanced level. This course uses mathematical overlays, which originally were originally see-through plastic schematics which were overlaid on his hand drawn charts. We make available digital copies of his 4 transparent overlay calculators which can be downloaded by owners of this collection, to be studied and used on electronic charts. To accompany this important set of courses, we have also gathered up all of Gann's most important writings on angles, resistance levels, geometry and mathematical tools, creating a comprehensive collection of Gann's most powerful geometrical tools. Finally we have included an enhanced set of his Master Charts.