Animal tracks: more common animals of the nearby hills
Pure Water, No Matter What: A Review of Berkey Water Filters
Improvised Water Filter
How to tie the world together: online knotting reference books
Ropes and knots are among the most ancient and useful technologies ever developed by man, predating the wheel, the axe and probably also the use of fire. Today, they are fast on their way to become an obsolete technology.
You can do this with most any wood too...some better than others...its the skill & knowledge of HOW that will work for you