Can anyone recommend any literature concerning naturally quarried hones? I'm mainly interested in British hones (still trying to track down any information on that that accursed Devonshire Oilstone,) but would be interested in anything that's out there.

I'm familiar with the Noviculite Survey Reports that have been linked to and referenced on SRP before, and wondered if there is a similiar report for hones found outside the US.

Kindest regards,
Alex