http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Nội dung giới thiệu những khái niệm cơ bản về tài nguyên, môi trường và sinh thái, tài nguyên nước và ô nhiễm môi trường nước, tài nguyên đất và ô nhiễm môi trường đất, ô nhiễm không khí