Sources and Links
A a very detailed and exhaustive source on most aspects
of the Franco-Spanish border markers is Mr Eef Berns' "The
Bordermarkers of the Pyrenees". The report describes almost
every single marker from the Atlantic coast and to the Mediterranean
Sea.
1.
The bordermarkers of the Pyrenees - Bordermarkers 600-602 http://www.grpdesbf.nl/esfr-html-markers-600-602.html
2.
The bordermarkers of the Pyrenees (2003 visit) http://www.grpdesbf.nl/esfr-html-trips-20030819.html