title: Photoelectric measurement of coal dust stains of filter paper.
authors.forename: C N
authors.initials: CN
authors.lastname: DAVIES
authors.forename: M
authors.initials: M
authors.lastname: AYLWARD
mesh_terms: D003031:Coal; D004396:Coloring Agents; D004391:Dust; D006801:Humans
chemical_list: D003031:Coal; D004396:Coloring Agents; D004391:Dust