Canal plans a) - "A plan of the Navigable canal from Chesterfield in the county of Derby to the River Trent near Stockwith in the county of Nottingham". Surveyed in 1769. Black and white print, dimensions 20 x 31 cm b) "A plan of the Navigable canal now making from the River Trent to Langley Bridge, in the counties of Derby and Nottingham". Surveyed in 1776 by J Smith. Black andk white print, dimensions 20 x 31 cm 18th cent