Clotilde Olyff's pebble alphabets

Rock collecting inspiration: Clotilde Olyff spent over a decade finding pebbles that look like letters, then assembled them into complete sets. Her stone alphabets were originally published in 2000 by Jan Middendorp in Lettered Typefaces and Alphabets by Clotilde Olyff (I have been searching for a copy of this book for YEARS) and featured in 3D Typography (2010).