The airfield book has superb detail and includes drawings of buildings. The detail is almost identical to an SD we used in the 60s which had all the bits omitted from the OS maps of the time. IIRC it was SD842 but that is digging really deep. An amendment was issued around 1967 that updated the book and removed all the useful historical data. The Military Airfields book is close to the earlier book with details of runway extensibility common with the SD.