The British Aircraft Specification File - 1994;hardback; nr fine. £25 

The Norman Thompson File - 1995; hardback; fine. £17.50

The K File. The Royal Air Force of the 1930s - 1997; nr fine. £27.50

The Harvard File - 1988 card covers; fine - £10.

The Martinsyde File - 1st, 1999; fine    £24