Observations on Man


 * (1749) Observations on Man, 1st edition
 * (17xx) Observations on Man, 2nd edition
 * (1xxx) Observations on Man, 3rd edition
 * (1xxx) Observations on Man, 4th edition
 * (1xxx) Observations on Man, 5th edition
 * (1834) Observations on Man, 6th edition