 Many of these Spanish or Mexican land grants were based upon incomplete documentation, in part because those governments did not issue deeds to the grantees, and records were kept variously at the territorial, state, vice-royal or imperial level.The court heard over three hundred cases involving over thirty-six million acres (150,000 km2) of land.Only eighty-seven land grants were confirmed, for a total of three million acres (12,000 km2), or less than 10%.