This work has no subject index but organizes its entries of special library collections by subject. Subdivision within subject is by U.S. state and Canadian province. Entries do not include information about staff but give address and communication numbers and also include notes on contents of collection. This is a good complement to DSL to ensure a wider gathering of sites. This guide organizes its entries by subject and then subdivides by country.
Entries are sparse, usually having an address and some communications information.
Organized by country, WGL subdivides entries by type of library, i.e., national, university, government, ecclesiastical, corporate, special, etc. Offering information similar to that of WGSL , it is also a synergistic complement to that work. Through these two resources one can check not only for special libraries in one country but for all libraries in a country that may have an ancillary relationship to one's subject. Thus, for example, one can find in WGSL agricultural history libraries in Chile and then in WGL Chilean ecclesiastical libraries that may contain sources relevant to historic demographics. Like many Gale publications, RCD has a subject index that leads one to main entries focusing on U.S. research centers.