Wanderings in Three Continents.

By the Late Captain Sir Richard F. Burton.

Edited with a preface by W. H. Wilkins.

First edition of 1901.
Hutchinson & Co.: London.

PDF Pages Images (Internet Archive). 

See also this alternative version.

A more complete reproduction of the manuscripts on which this book was based has been published more recently. See Sir Richard Burton's Travels in Arabia and Africa: Four Lectures from a Huntington Library Manuscript, edited with an Introduction by John Hayman (Huntington Library Press, 1990).