MADISON, Wis. -

Wisconsin public schools have received $30.1 million from a state trust fund to help purchase materials for their libraries.

School districts can spend the money awarded Monday on books, newspapers, periodicals and some digital materials.

A state trust fund set by the constitution uses loan interests generated on public lands to support the cause. Revenue from unclaimed property, penalties and timber production also contribute to the fund.

The Board of Commissioners of Public Lands distributes the aid to the Department of Public Instruction each year.

The DPI will disseminate the aid to school districts by May 1. The districts have to finish their purchases by June 30.