1
by Playfair, William
Published 1787
Printed for J. Debrett, Piccadilly, and G.G.J. and J. Robinson, Paternoster-Row

2
by Playfair, William
Published 1797
Printed for the author, and sold by Crosby; Stationers' Court, Ludgate Hill

3
by Playfair, William
Published 1785
Printed for G.G. J. and J. Robinson, Pater-Noster-Row

4
by Playfair, William
Published 1785
Printed for G.G. J. and J. Robinson, Pater-Noster-Row

6
by Playfair, William
Published 1798
printed for the author, and sold by A. Paris, Rolls'-Buildings, Fetter-Lane