The biographical material include curricula vitae, several bibliographies, and clippings from both scientific and lay publications. Of special interest is a set of diaries from 1955 through 1968; many of the entries here are long and detailed, and they deal with both his work and his personal life. The journal documenting his trip to China in 1974 is partly in English and partly in Chinese. Other biographical materials are also partly or wholly in Chinese. Many of the entries in English in these journals consist of reading, writing, and financial notes. Included with copies of Huang's obituaries are materials (in English or Chinese) reporting on a memorial service in Beijing, at which his sister was present, and documents related to his death. A memorial by D.E. Osterbrock (published in the Astronomy Quarterly) presents a personal portrait of Huang and has a good photograph of him as its frontispiece.
The education files include three folders, mostly of reading and lecture notes, from his bachelor's work and ten folders of similar material from his doctoral program.
The general correspondence consists primarily of letters relating to Huang's various publications or manuscripts in progress. There are a few personal letters, including some from his younger brother, Don, also an astronomer. Some letters are in Chinese.
The teaching files include many manuscripts of and notes for lectures.
The research files occupy seven boxes. This material includes notes and drafts on a variety of topics, some observational material, graphs and illustrations, computer printouts, and proposals and reports for a NASA grant.
The speeches files contain notes for and drafts of talks, mostly before scientific groups but a few to lay groups.
The publications files consist mainly of drafts and reprints of articles, although there are parts of three books.