Also, often, if the women worked in their own home - piecework, laundry, sewing, etc, they often did not mention it. In mining areas some women also worked on the surface, sorting coal, but although there are frequent references to them, they do not often seem to crop up in censuses. Perhaps there were womend working casually, but neither they nor the head of household liked to think that they were "workers" rather than full-time wives?