 With Peter Perez Burdett Perry had planned a map of Liverpool, together with a history and views by Michael Angelo Rooker, though the latter project did not all come together in its initial conception before his death.In 1769, assisted by William Yates, Perry produced his masterpiece as a cartographer, a large map entitled 'The New and Accurate Plan of the Town and Port of Leverpool'.In 2008 this was on public display at the Walker Art Gallery and proved to be a centre of attention.