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Peter Welsh was an historian of pre-industrial technology, a museum curator and director. This is how he introduces this paper:

This history of woodworking hand tools from the 17th to the 20th century is one of a very gradual evolution of tools through generations of craftsmen. As a result, the sources of changes in design are almost impossible to ascertain. Published sources, moreover, have been concerned primarily with the object shaped by the tool rather than the tool itself. The resulting scarcity of information is somewhat compensated for by collections in museums and restorations.

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The who, what, where, when, and how of rock-art. This richly illustrated book will guide you to 28 outstanding rock-art sites in seven states, and teach you about art styles and the cultural groups that created them. Includes a resource guide to continue your exploration.