The main rulebook serves as a place to reference basic rules within the army books. 

Witch Hunters

Dark Eldar 

Space Marines

Orks

Tyranids

Eldar

Imperial Guard

Chaos Space Marines

Tau

Necrons

Daemonhunters

Chaos Space Marines 3.5

Space Wolves

Craftworld Eldar

Blood Angels

Catachan

Assassins

Eye of Terror

Armageddon

Dark Angels

Chapter Approved (2002) 

Chapter Approved (2003) 

Chapter Approved (2004) 

Imperial Armour

Imperial Armour 2

Imperial Armour Update

Copy Needed

Imperial Armour Volume One

Imperial Armor Volume Two

Index Astartes I

Index Astartes II

Index Astartes III

Index Astartes IV

Citadel Journal 29

Citadel Journal 33

Citadel Journal 34

Citadel Journal 36

Citadel Journal 39

Citadel Journal 40

Citadel Journal 41

Citadel Journal 49