Revision material for the GSGS map of Yola province, covering an area approximately 8 miles south and south-west of Yola town. Comprises 2 field sheets, with a photo-reduction at 1:125,000 on which significant revisions to relief is plotted with detailed form lines.
Revision material for the GSGS map of Yola province, covering an region extending from approximately 50 to 90 miles north of Yola town. Comprises 6 field sheets, with a fair drawn compilation at 1:125,000 (and a photo-reduction of this at 1:250,000) on which significant revisions to relief is pl...