Show 10 5 10 15 20 50 100 250 Sort by year (new to old) Actions Download search results Subscribe to news feed Your filters: cql: year exact 1920 Add to list Journal Article A4 Les concrétions de charbon Xavier Stainier (1920) ANNALES DE LA SOCIETE SCIENTIFIQUE DE BRUXELLES. 50(1). p.247-255