An economy measure used during World War One was the mixing of coal-slack with clay to make an efficient substitute for coal. From The Pageant of the Century, published 1934 Stock Photograph

Stock Photograph - An economy measure used during World War One was the mixing of coal-slack with clay to make an efficient substitute for coal. From The Pageant of the Century, published 1934. Fotosearch

An economy measure used during World War One was the mixing of coal-slack with clay to make an efficient substitute for coal. From The Pageant of the Century, published 1934

12285936 | Design Pics | Royalty Free

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