The Tree Climber's Companion: A Reference and Training Manual for Professional Tree Climbers (3rd Edition, Revised and Expanded) by Jeff Jepson

The Tree Climber’s Companion: 3rd Edition by Jeff Jepson, Bryan Kotwica and Rick Kollath (Illustrators) 

This is the definitive field manual for professional arborists, students, and anyone who climbs trees for work or recreation. This updated and expanded edition adds 88 new pages, including three new sections, revised terminology, detailed illustrations, and expanded coverage of entering the tree, rope handling, and essential knots for climbing and rigging. Compact yet comprehensive, it serves as both a quick reference guide and a complete training tool for safe, efficient tree climbing. Ideal for arboriculture professionals, tree care crews, and outdoor enthusiasts seeking practical, real-world climbing techniques backed by decades of experience.