There has been data ("Le Cercle Proudhon, 1911-1914: Entre le syndicalisme révolutionnaire et l'Action Française (Les Travaux de l'Atelier Proudhon)") available for this ISBN from the data sources that books-by-isbn.com uses, but not on the latest request on Sun Feb 9 12:06:08 2020, so the data displayed here has been removed .