The Whetstone Quarry: On Finding a Sharpening Stone

Here's a small sample from Roy Underhill's new book, The Woodwright's Companion.

sharpening stone - Arkansas stone sharpening a chisel
A whetstone should be kept in a protective wooden box. This century-old white Arkansas stone, shown in its case, will put a mirror-finish edge on the tools it sharpens. 
Roy Underhill and MOTHER EARTH NEWS Staff