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In page Dawes Act:

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In addition, the fractionation of land and the resultant ballooning number of trust accounts quickly produced an administrative nightmare. Over the past 40 years, the area of trust land has grown by approximately 80,000 acres (320 km2) per year. Approximately 357 million dollars[citation needed] is collected annually from all sources of trust asset management, including coal sales, timber harvesting, oil and gas leases and other rights-of-way and lease activity. No single fiduciary institution has ever managed as many trust accounts as the Department of the Interior has managed over the last century.[citation needed]