This chapter describes the operation of the COP8 Librarian, LIBCOP. LIBCOP reads object modules produced by ASMCOP and combines them into one file called a library. The linker can then search a library for any public symbols that match undefined external symbols. If a symbol is found, the linker reads its object module. Thus, one or more from a group of standard routines may be included in a program by forming the group into a library.