Early British Trackways, Moats, Mounds, Camps and Sites by Alfred Watkins [1922]

This was the first book about ley lines. Ley lines are alignments on the landscape of natural and artificial features, some of which follow perfectly straight tracks for miles. First discovered in Britain by the author of this book, Alfred Watkins, a photographer and inventor, ley lines were pursued eagerly by organized clubs in the period between the world wars. Interest in leys died out after the 1930s, but was revived in the 1960s, after the publication of a popular book on the subject, The View Over Atlantis,