Up for sale is a collectible set of two vintage U.S. Army Graphic Training Aid (GTA) pocket cards. These are high-quality, period-authentic reprints produced by the legendary Panther Publications (Boulder, Colorado), a key publisher of military and survivalist literature during the 1960s and 1970s. What’s Included: GTA 5-1: Demolition Card Content: Critical field data for military explosives, including relative effectiveness ratios for TNT, C3, C4, and Ammonium Nitrate. Features "Rules of Thumb" for cutting steel, timber, and breaching concrete. Format: Double-sided reference card with technical tables and conversion factors. GTA 5-21: Mine Card Content: Standardized guide for installing, arming, and recording land mines. Includes detailed diagrams for minefield layouts, warning sign placement (Red/White triangular signs), and perimeter fencing specifications. Format: Illustrated tactical guide.