Aberdeenshire Commissioners of Supply: Robertson's Map Papers - Copy letter from Thomas Burnett to James Robertson regarding the delay and loss of subscriptions to the map (1817) States that as a result of Robertson's delay in completing the map of Aberdeenshire and Banffshire, many subscribers have either died or moved, resulting in a great loss of subscriptions, for which the Map Committee do not hold themselves responsible. 25 September 1817