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Ecodefense: A Field Guide to Monkeywrenching
Caltrops w/ rusty used nails and scrap junk
Caltrops (Tire-Popping Spikes) - Mikes Inventions
Night Watchman Railroad Spike Caltrop Solid Iron
Caltrops Spikes
Wow! Smart Boy Use Car Tire Fishing big fish Trap Catch A lot of
Caltrops Tire Spikes
Caltrops Tire Spikes, 100 Pcs Car Tire Studs Anti Slip Road Snow Tire Puncture Spikes SUV ATV Wheel Stud Screw Trim Auto Winter Car Kit for Snowmobile Ramp 12mm : Automotive
Caltrop Demonstration
50 Large Caltrops – Caltrop Security Systems
Ecodefense: A Field Guide to Monkeywrenching
Three pieces of roman caltrops
How to make WWI German patter caltrops
DIY Stop Sticks