As of Version 7.0, Histogram3D is part of the built-in Mathematica kernel.

generates a three-dimensional bar graph representing a histogram of the bivariate data .

Histogram3D[{{f11, f12, ..., f1l}, ..., {fk1, fk2, ..., fkl}}, FrequencyData->True]
generates a histogram of the bivariate data, where is the frequency with which the original data falls in the category .

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