The William J. Wilgus Papers (1895-1947) finding aid organizes its content using taxonomy. The key terms attached to this document allows for researchers to connect and understand the relation between relevant persons, entities, subject topics, and physical evidence/artifacts. The actual content, itself, is organized in a very long, detailed outline, using main topics, subtopics, and a combination of capital Roman numerals, Arabic numerals, and, capital and lowercase letters. As the outline progresses, general information about his professional career evolves into his personal essays of “military reorganization, transportation, and war preparedness” (William J. Wilgus Papers, 1895-1947, p.4).  If a researcher decided  to write a research paper about Wilgus or Grand Central Terminal, he/she could easily use this finding aid to locate additional sources not located in the “Stacks” or “References” sections in a library, or, could use the key terms or subjects within the finding aid to conduct academic database searches.