"Prisoners of Poverty Abroad" by Helen Campbell
Campbell was a social reformer and pioneer in the field of home economics. This is a very engrossing and thought-provoking read that explores the conditions of the poor and the working poor. It showcases the horror of poverty and how many people once had to work such horrific hours for barely enough money to keep themselves and their families alive, often surviving on bread and tea. It's also a mirror of today's society.