Shetland Islands : Eastern approaches to Yell Sound, Colgrave Sound and Bluemull Sound.
Great Britain.Hydrographic Office.
Taunton : [United Kingdom Hydrographic Office],
1982-
Relief shown by contours and spot heights. Depths shown by soundings.
Various eds.
1982 ed. titled: Eastern approaches to Yell Sound, Basta Voe and Bluemull Sound.
1982 -- 1986 -- 1991 -- Ed. 4 2004