Knots at Work: A Field Guide for the Modern Arborist is a 184 page guide to the tying, use, and history of over fifty knots commonly used in tree work. This book by the author of the Tree Climber's Companion and To Fell a Tree is richly illustrated with clear drawings and diagrams by Bryan Kotwica, making the tying of the knots and uses clear and easy to see. In addition to knot-tying examples, the book is filled with history, commentary, and application advice.