Watkins, Alfred,
Early British Trackways, Moats, Mounds, Camps and Sites (1922) The Watkins Meter Company, Herefordshire.

The Old Straight Track (1925), Methuen, London

The Ley Hunters Manual (1927)

Archaic Tracks around Cambridge (1932)
Please Note : All the above books should be classed as antiques or very collectable items for libraries and so should be stored carefully giving others the chance to read and discuss Watkins' research)

Broardhurst, Paul & Miller, Hamish
(1989) ISBN 0-9515183-1-3, The Sun and The Serpent (1989) Pendragon Press, Launceston, Cornwall.

Graves, Tom,
Needles of Stone, (1978)
Needles of Stone (1980). Granada, London.
Needles of Stone Revisited. (Revised edition, 1986), ISBN 0-906362-07-5, Gothic Image Publications.

Devereux, Paul & Thompson, Ian
The Ley Hunters Companion (1979), ISBN 1-871343-00-3, Thames and Hudson England.