Level 1: Introduction to Fundamental Concepts
Introduction to Historical Materialism - Alan Woods and Rob Sewell
Historical Materialism: A Study Guide - Mick Brooks
Level 2: Eras and Events
Civilization, Barbarism, and the Marxist View of History - Alan Woods (And Part Two)
Level 3: Engels' Letters
Level 4: Before Capitalism
Pre-Capitalist Economic Formations - Karl Marx
Level 5: Classical Elaborations
The Materialist Conception of History - Plekhanov