Just got in the mailbox a copy translated to Spanish of such phenomenal piece, written by the Swiss Army Major Hans Von Dach. Resistencia Total is a book which explains some of the tactics used in guerrilla warfare and underground operations. A must-to-have document for all the war history enthusiasts out there.
The original Swiss version is known as "Der totale Widerstand: Eine Kleinkriegsanleitung für Jedermann"