FASTEST WAY TO DIG A TRENCH | How to Dig a Trench With a Demo Hammer - YouTube
Radius Root-Cutter Trenching Spade - Lee Valley Tools
Trenching Guide | hand tools, shovels, + power trenchers
Amazon.com : GeoRipper MiniTrencher GR620, Handheld and Lightweight Mini Trencher That Offers Portability and Fast Digging Capabilities for Landscaping and Irrigation Applications : Patio, Lawn & Garden