Mechanical Advantage Series by John Middendorf
From Dave Smart: “More incredible, careful work. Thanks, I learned a lot. The point about when actually reliable carabiners were introduced is a really good one. The visual research is also very good.”. Thanks!
From Dave Smart: “More incredible, careful work. Thanks, I learned a lot. The point about when actually reliable carabiners were introduced is a really good one. The visual research is also very good.”. Thanks!