6.1. Housing https://history.pictures/2020/02/05/6-1-housing/
6.2. Sanitation https://history.pictures/2020/02/05/6-2-sanitation/
6.3. Poor Areas of the Cities https://history.pictures/2020/02/05/6-3-poor-areas-of-the-cities/
6.4. Child Mortality https://history.pictures/2020/02/06/6-4-child-mortality/
6.5. Life Expectancy https://history.pictures/2020/02/07/6-5-life-expectancy/
6.6. Industrial Diseases and Pollution https://history.pictures/2020/02/07/6-6-industrial-diseases-and-pollution/