By 1807 he owned 3,000 acres ( 12 km ) of land .
Marsden was given grants of land by the colonial government and bought more of his own , which were worked with convict labour , a common practice in Australia at the time .
By 1807 Marsden owned 3,000 acres ( 12 km ) of land .
Marsden was given grants of land by the colonial government and bought more of his own , which were worked with convict labour , a common practice in Australia at the time .