The Lebombo Bone is a baboon fibula with incised markings discovered in the Lebombo Mountains located between South Africa and Swaziland in the 1970s. Some writers have suggested that it was used as a tally stick. It is roughly 35,000 years old, older than the Ishango bone.
- "Africa : The true cradle of mathematical sciences". AfricaMaat. Retrieved 2012-08-01.
- Robert S. Houghton, Ph.D. "A Brief Timeline in the History of Computers". Wcu.edu. Retrieved 2012-08-01.