Rene Caillie 
Travels Through Central Africa to Timbuctoo and Across the Great Desert to Morocco, 1824-28 
Volume 2

Rene Caillie was the first European who penetrated to Timbuctoo and returned to communicate the information he had collected. This account was first published in 1830, and records observations of a journey of 4500 miles, of which 3000 were hitherto unknown to Europeans.