A New System of Knotting by Harry Asher
is the latest specially commissioned I.G.K.T. publication and comes in two volumes. (1986) Republished as one volume by IGKT in 2017 ISBN 9780993190834
Dr. Asher, a retired research scientist, describes his original and methodical approach to tying traditional knots and discovering new ones. Volume 1 (47 pages) includes explanations of right and lefthandedness of knots, symmetry, linked overhand knots, and carricks. Volume 2 (36 pages) describes bends from loops, and vice versa, double & multiple loops, bottle knots, hitches & spiral plaits. Scholarly, but fun sums up the text of these two volumes illustrated clearly by Eleanor Draper. Apt anecdotes, fresh insights and some new knot names all combine to expand the old accumulated knowledge.
Note: With the author's full permission,this terrific book has been reset and re-published by the Guild and is available from the Supplies Secretary.