Second language learning -- See Second language acquisition Here are entered works which discuss the social and psychological processes involved in learning a second language. Works which discuss the study and teaching of a second or foreign language are entered under the heading Language and languages--Study and teaching.
--subdivision Education (Secondary) under classes of persons and ethnic groups; and subdivision Study and teaching (Secondary) under names of individual corporate bodies, names of places, ethnic groups, and topical headings, e.g. Science--Study and teaching (Secondary)
--subdivision Supplementary employment under classes of persons and ethnic groups; and subdivision Officials and employees--Supplementary employment under names of countries, cities, etc., and under individual government departments, agencies, etc.
Secondary markets -- See Also Secondary mortgage market Here are entered works on the informal market in which previously created mortgages are traded.
Secondary materials (Recycled products) -- See Recycled products Here are entered works on commercial products with recycled content. Works on the debris resulting from a process, such as manufacturing, that is of no further use to the system producing it are entered under Waste products.