... nous population. In 16 16 -16 19 an epidemic, possibly of bubonic or pneumonic plague, swept coastal New (40) England, killing as many as nine out of ten. During the 16 30’s smallpox, the ... the period 18 70 -1 920 , Keyssar concentrates on Massa- chusetts, where the historical materials are particularly rich, and the findings applicable to other industrial areas. (15 ) The unemployment ... in 18 70 than in 18 90. (B) White-collar professionals such as attorneys had as much trouble as day laborers in maintaining a steady level of employment throughout the period 18 70- 1 920 ....