ALLEN, Willam (1793-1864). Picturesque Views on the River Niger, sketched during Lander's last visit in 1832-33, London: W. Clowes & Sons for John Murray, Hodgson & Graves and Ackerman, 1840. Oblong 2° (275 x 373mm). 2pp. list of subscribers, dedication to Prince Albert. Lithographed map, 22 tinted lithographed views on 10 plates, one folding, all after Allen, drawn on stone by Allen, W. L. Walton, T. Picken and C. Haghe, all printed by Day & Haghe. (Map and 8 plates spotted.) Original purple cloth, the upper cover with title in gilt below the royal arms blocked in gilt (inner hinges repaired). Provenance: Mrs. Pew (author's presentation inscription 'Presented to Mrs. Pew with best regards, by the author William Allen'). PRESENTATION COPY. Allen had accompanied Richard Lander and Oldfield and carried out a survey of the River Niger in 1832-1833. The present work was published in light of the interest that the proposed expedition of 1841-1842 (under the command of Captain Trotter) generated. Allen went on to command the Wilberforce on this ill-fated expedition. HUTTON, William (Consul at Ashanti). A Voyage to Africa, London: 1821. 8° (210 x 130mm). 4 hand-coloured aquatint plates, 2 folding engraved maps. (Light offsetting onto plates.) 20th-century half calf. Provenance: ROBERT SOUTHEY (title inscribed by Southey 'Robert Southey from the publisher, Keswick 30 Nov. 1821'). Abbey Travel 280. VERNER, Willoughby, Captain. Sketches in the Soudan, London: R. H. Porter, 1885. Oblong 2° (287 x 383mm). Hand-coloured plan, 37 chromolithographed plates, 2 pages of advertisements at end. (A little spotting and some offsetting.) Original printed boards (worn at extremities). (2)