SuDocsClassification System

• Developed by GPO librarian Adelaide Hasse 1895-1903

• Divided into two parts:

  • Class number appears before the colon
    • Letter or letters = agency or executive department
      • “A” for agriculture, “JU” for judiciary, and "NS" for National Science Foundation. The letters "X" and "Y” are reserved for congress.
    • First number = issuing bureau