: Marking major industrial hubs, railroads (like the Trans-Siberian), and agricultural zones.

While GDZ serves as a helpful verification tool, educators recommend using it primarily to check work after attempting the tasks manually. Copying directly without understanding the historical context often results in poor performance during in-class map tests. Students can find these resources on various educational portals or by purchasing the official Atlas and Contour Map sets for self-study.

: Territorial expansions and fortresses in the southern borderlands.