Laing (who had reached Timbuktu by way of Tripoli) obtained some accurate information concerning the sources of the river, and in 1828 the French explorer Rene Caillie went by boat from Jenne to the port of Timbuktu.
Laing, Catalogue of Ancient Scottish Seals (1858, 1866); Douet d'Arcq, Collection de sceaux (Inventaires et documents des archives de l'Empire) (3 vols., 1863-1868); G.
- Knox's books, pamphlets, public documents and letters are collected into the great edition in six volumes of Knox's Works, by David Laing (Edinburgh, 1846-1864), with introductions, appendices and notes.
Laing (Edinburgh, 1872-1879); and Walter Bower's continuation of John of Fordun's Scotichronicon, edited by T.
Laing (Edinburgh, 1872-1879); John of Fordun, Scotichronicon, continued by Walter Bower, edited by T.