The introduction to this paper discusses the definition of the scope of library and information science and establishes what is included under the term "periodical." The main types of periodicals are considered to be: professional and academic, international, periodicals outside the field and secondary periodicals. The second section considers periodical publishing in librarianship, documentation and archives. Those classes of periodicals which were excluded from discussion are noted and the methods for determining the "core" of periodicals are described. Methods for improving the editing and publishing of periodicals is the subject of the third section and the coverage of professional literature in secondary publications is the topic of section four. This fourth section gives a comparison of: "Library and Information Science Abstracts,""Referativnyj Zhurnal," and "Information Science Abstracts." The final section of this paper consider the promotion of international co-operation between editors of journals. The appendices list periodicals by country, by language and by rough categorization; as well as periodicals outside the field of librarianship and documentation. Subject presentation used by the large abstracting services is also appended. (NH)