This series is arranged in twenty-eight subseries broadly by publication date or date of presentation/lecture. Some papers are arranged by date in which they were edited, and therefore may not be located in the year in which they were initially published. Multiple versions may exist across different subseries. If the date of publication is unknown, but the date range of the material in the folders is known, the date range is used. Undated materials are located in a subseries titled, "Undated." Born-digital materials are integrated into corresponding subseries based on content. The original order of the born-digital files is retained.