Babylonian law is a subset of cuneiform law that has received particular study, owing to the singular extent of the associated archaeological material that has been found for it. So-called "contracts" exist in the thousands, including a great variety of deeds, conveyances, bonds, receipts, accounts, and most important of all, actual legal decisions given by the judges in the law courts. Historical inscriptions, royal charters and rescripts, dispatches, private letters and the general literature afford welcome supplementary information. Even grammatical and lexicographical texts contain many extracts or short sentences bearing on law and custom. The so-called "Sumerian Family Laws" are preserved in this way.