CATEGORY A - AIRCRAFT                            A1 - RAF AIRCRAFT

A2 - MARITIME/NAVAL AIRCRAFT

A3 - USAF AIRCRAFT

A4 - OTHER INDIVIDUAL COUNTRIES' AIRCRAFT

A5 - AIRCRAFT WORLDWIDE (more than one country)

A6 - AIRCRAFT MANUFACTURERS/CIVIL AVIATION

A7 - MISCELLANEOUS

CATEGORY B - AIR FORCES                       B1 - ROYAL AIR FORCE

B2 - RAF COMMANDS AND SQUADRONS

B3 - RAF BASES

B4 - INTERNATIONAL AIR FORCES

CATEGORY C - AVIATION ART AND PHOTOGRAPHY

CATEGORY D - EQUIPMENT AND TECHNIQUES

D1 - OPERATIONAL TECHNIQUES (including Armaments and Weapons)

D2- TRAINING

D3 - ENGINEERING

D4 - MISCELLANEOUS

CATEGORY E - REFERENCE                          E1 - GENERAL REFERENCE

E2 - JANE'S

CATEGORY F - CAMPAIGNS (WORLD WAR II)

F1 - BATTLE OF BRITAIN

F2 - BOMBER COMMAND

F3 - COASTAL COMMAND AND MARITIME

F4 - D-DAY

F5 - LUFTWAFFE

F6 - POWs

F7 - MIDDLE EAST, MED, N. AFRICA, SE ASIA, FAR EAST

F8 - WORLD WAR II MISCELLANEOUS

CATEGORY F - CAMPAIGNS (POST WORLD WAR II)

F9 - THE COLD WAR

F10 - VIETNAM WAR

F11 - THE FALKLANDS

F12 - THE GULF WAR

CAMPAIGNS, MISCELLANEOUS

CATEGORY G - PERIOD HISTORIES

G1 - GENERAL

G2 - DEVELOPMENT AND USE OF AIR POWER

G3 - HISTORY OF AVIATION/POWERED FLIGHT

CATEGORY H - PERSONALITIES                 H1 - AUTOBIOGRAPHIES

H2 - BIOGRAPHIES (in order of subject)

H3 - MEMOIRS, REMINISCENCES, DIARIES, PERSONAL STORIES

CATEGORY J - JOURNALS AND SETS    J1 - AIR CLUES

J2 - RAF YEAR BOOK (RAF BENEV. FUND)

J3 - RAF HISTORICAL SOCIETY

J4 - TIME LIFE SERIES

J5 - AEROPLANE, AIR PICTORIAL

J6 - MISCELLANEOUS