A catalogue of the very capital choice and valuable collection of Italian, French, Flemish and Dutch pictures formed at great expence in the course of several years, by John Humble, Esq. ... selected from the Aldobrandini, Barberini, Cavalieri, Colonna and Spoletto palaces ... Among them are: gallery & exquisite cabinet pictures ...: they will be sold by auction by Mr. Christie, at his great room, in Pall Mall, on Saturday, April the 11th, 1812 ...