Referenced In

How I Found Livingstone
by Henry M. Stanley

"This was a question often asked by owners of down caravans, and the reason of it is that the Arabs, in their anxiety to make as much as possible of their cloth at the ivory ports on the Tanganika and elsewhere, are liable to forget that they should retain a portion for the down marches."

The Travels of Marco Polo
by Marco Polo, da Pisa Rusticiano

"the whalebone that was passed off at Zanzibar as the wing of a bird, came, they said, from Tanganyika."

The Travels of Marco Polo
by Marco Polo, da Pisa Rusticiano

"Natives claimed that an object—purportedly part of a gigantic bird’s wing—had been brought from Tanganyika."