The Shetland Isles / 
Thomas, George.
Walker, C.
Walker, J.
[London] :  Admiralty, 
1838.
Admiralty chart no. 1118.
Entry in numerical Admiralty index.
Given as c. 3 miles to 1 inch on previous catalogue entry.
Insets: Hillswick or Urie Firth; Balta Sound; Entrance to Scalloway; Bressa Sound or Lewick Harbr.
Scale taken from 1 ̊longitude.