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Florentine Codex, Page I, F, 6r.

A heart sacrifice is done before the altar of     an earth or underworld deity with a ferocious     image. The sacrificial priest wears black body     paint. Below, two worshippers carrying white     incense pouches pierce their tongues and     ears with large bone awls. On their right, a     ball of copal burns above an offering of paper.     Tudela Codex.

The great droughts of 1450-1454 led to massive sacrifice of children to      water deities. Telleriano-Remensis Codex.

Tlatelolco. The remains of 41 sacrificial victims. 30 infants and       the rest youths and adults found at the foot of the stairway of       the Ehecatl-Quetzalcoatl temple.

ARTIFACTS ASSOCIATED WITH HUMAN SACRIFICE
Tzompantli
Sacrificial knives
Offering Vessels
    Tiger
    Eagle
 

ARTICLES:
Aztec Cannibalism: An Ecological Necessity?
The Enigma of Aztec Sacrifice
The Incidence and Significance of Disease among the Aztecs and Related Tribes