'Observations Medical and Political: on the small-pox and inoculation and on the disease of mankind at every age' 'Observations Medical and Political: on the small-pox and inoculation and on the disease of mankind at every age with a comparative view of the diseases most fatal to London during ninety years.' by W. Black. Printed for J. Johnson, No. 72, in St. Paul's Church- yard, London 1781. 1781