@inbook{10.4169/j.ctt6wpwdk.6,
ISBN = {9780883853399},
URL = {http://www.jstor.org/stable/10.4169/j.ctt6wpwdk.6},
abstract = {People began to count long before they began to write. In the late 1930s, an archaeologist sifting dirt in what is now the Czech Republic stumbled upon the most ancient mathematical object found so far: a 30,000-year-old wolf bone with 57 notches in it. These were arranged in groups of five, much as in today’s tally-method, suggesting that people may have counted on their fingers then. The relic offers no clue as to what was being counted. Was it days? food supplies? Some 25,000 years later, when trading had grown more widespread, such missing information became important, and filling it},
bookauthor = {Keith Kendig},
booktitle = {Sink or Float?: Thought Problems in Math and Physics},
edition = {1},
pages = {33--44},
publisher = {Mathematical Association of America},
title = {Numbers},
volume = {33},
year = {2008}
}