Federal-State Cooperative System ID is an ID used for public libraries in the United States of America.
Used i.e. here – https://data.imls.gov/Public-Libraries-Survey/Public-Libraries-Survey-2016-Main-Libraries-Branch/7phu-k3r5/data
Will be necessary to import "Public Libraries Survey 2016: Main Libraries, Branches, and Bookmobiles (Outlets)"