Issues for 1906-17 include reports on plague investigation in India, 6th-10th reports; and Plague supplements, no. 1-5; and Parasitology v.1-5.

Vol. 2-7 include Proceedings of the Society of Hygiene of the School of Hygiene and Public Health of Johns Hopkins University.

Employees, employers and the government have all become very awareof the effects on health of the work environment. As a result, thissubject area is rapidly dev