The Shatapatha Brahmana reference article from the English Wikipedia on 24-Apr-2004
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Shatapatha Brahmana

Shatapatha Brahmana (Brahmana of one-hundred paths) is one of the prose texts describing the Vedic ritual. It belongs to the White Yajurveda school. Some scholars have dated it to 1800 BC or so based on the reference in it of migration from the Sarasvati river area to east India, because the river is said to have dried up around 1900 BC.

It has the greatest value in the understanding of the Vedas.