Here are entered works on the total infrared radiation emitted from the earth's surface. Works on the infrared radiation emitted by or propagated through the atmosphere are entered under Atmospheric radiation.
--subdivision Control under individual weeds and groups of weeds, e.g. Prickly pears--Control; Aquatic weeds--Control; and subdivision Weed control under individual crops and groups of crops, e.g. Corn--Weed control
Here are entered works on languages belonging to the Iranian group of the Indo-European language family. Works on the various languages spoken in Iran are entered under Iran--Languages.
--subdivision Chronology under names of individual persons, sacred works, literatures, wars, individual art forms, headings for national or ethnic art, and topical headings that are inherently historical; and subdivision History--Chronology under names of countries, cities, etc., and individual corporate bodies, and under ethnic groups and topical headings that are not inherently historical