http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Nội dung bao gồm: Quang học, âm học, điện học với những ví dụ dễ hiểu giúp các em nhận biết và ứng dụng trong cuộc sống và học tốt hơn.