Looseleaf service

A looseleaf service is a type of publication used in legal research which brings together both primary and secondary source materials on a specific field or topic in law.

Looseleaf services are typically contained in ring binders to keep them updated, because they are published fairly frequently (at minimum monthly, sometimes weekly or bi-weekly) in order to keep the information therein current.

[1] In an interfiled looseleaf service, individual pages can be removed and replaced with more recent printings, eliminating the need for pocket parts or similar supplements.

[1] All these newsletters are intended to be permanently retained, which distinguishes them from the interfiled looseleaf services where obsolete pages are supposed to be discarded.

[1] One of the best-known looseleaf services, United States Law Week, is of this type.