Changes made

Some footnotes, tables and illustrations moved; some tables re-arranged.

Some minor obvious typos corrected silently

R.L. and R. L. have been standardised as R. L, spaces between numbers and percent signs have been removed where present.

Appendices: the numbering of some of the tables has been corrected, some minor lay-out inconsistencies have been resolved.

page 12: Afrika’s Ströme and Flüsse changed to Afrikas Ströme und Flüsse

page 32: Fort Barkeley changed to Fort Berkeley as elsewhere

page 36: 15. The Sobat River changed to 16. The Sobat River

page 70, Section 30: italics changed to bold as with other headings

page 72, calculations: Total materials taken out of category Materials not paid for