It sounds like you're referring to a specific resource titled "Gann for the Active Trader" (likely a PDF). This is most commonly associated with the work of Robert Krausz, a trader and educator who wrote extensively on applying W.D. Gann’s principles to modern, active trading (especially in futures, forex, and stocks).
(Direct PDF): A massive, searchable collection of Gann's original stock market lessons, meticulously transcribed to preserve his original techniques on time cycles and geometry. The Best Gann Fan Trading Strategy Guide gann for the active trader pdf