What did mayan stoneworkers use to decorate their buildings and other large stone structures?

Glyphs

Explanation:

Mayan stoneworkers used glyphs in order to decorate their buildings and other large structures. Mayan glyphs were the writing system of the Mayan people. Therefore, although some glyphs fulfilled the function of decoration, some were also used in order to convey important information. The Mayan script has now been deciphered. However, modern Mayan is generally written using the Latin alphabet.

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it proved indian land claims were unjustified.