The projection of the maps is Lambert Conformal Conic.
Lambert conformal conic projection (preserves angles, commonly used in aviation navigation maps)
Christopher Lambert | Adam Lambert | orthographic projection | Paul Lambert | projection | Mercator projection | Lambert | Woluwe-Saint-Lambert | Lambert Simnel | Drexel Burnham Lambert | Andrew Lambert | Kit Lambert | Johann Heinrich Lambert | George Washington Lambert | George Lambert | Warner–Lambert | John Lambert | Constant Lambert | Space-oblique Mercator projection | Psychological projection | Mary Lambert | Lambert Wilson | Lambert Wickes | Lambert of Hersfeld | Lambert Meertens | Isometric projection | Constantin Wilhelm Lambert Gloger | Astral Projection | Yvon Lambert | St. Lambert |