An accurate map of the matchless lake of Derwent ... near Keswick, Cumberland / 
Crosthwaite, Peter.
Ashby, Marry.
Keswick :  P. Crosthwaite, 
1782.
"Engraved by H. Ashby".
Early version (much less detail, different engraver & smaller size) of map in Crosthwaite's "A series of accurate maps of the principal lakes of Cumberland ... 1794".