Archival records • Interviews • Surveys • Statistics (numerical data) • Official documents • Websites • Articles in the media • Public statements • Social media • YouTube videos, etc.
In the HOLLIS Advanced Search, combine your search topic with words such as:
You can express your topic in general Keywords, or as a Subject using terms created by the Library of Congress (see more about this here).
Often, the sources you find will be a combination of primary data and secondary analysis of the data. Here are examples.
Sample searches in HOLLIS Advanced Search:
A statistics portal that integrates thousands of diverse topics of data and facts from a wide range of sources onto a single platform. Sources of information include market research, trade publications, scientific journals, and government databases.
Sample report: Millionaires in the United States
For other statistical sources, see the Beginner's Guide to Locating and Using Numeric Data, by Harvard Librarian Diane Sredl.
HOLLIS has two main parts. There’s the traditional Library Catalog of Harvard's books, journals, films, sound recordings, maps, and so on. Then there’s a huge additional database of articles, reviews, etc. which come from various sources outside Harvard. Many of these are available in full text online through Harvard's subscriptions.
You can search the Library Catalog separately, or -- especially if you want to see articles -- search for "Catalog and Articles." These choices appear as soon as you start to type a search.
Turn to the next page for tips on using HOLLIS effectively.
► But . . . won't I get all the articles I need with HOLLIS?
HOLLIS will give you a lot of articles, but specialized databases can give you more focused results from specific fields of study.
Most of the records in HOLLIS have linked Subject Headings that you can use as a springboard for finding similar items. Most of the headings in the Library Catalog have been specially crafted by the Library of Congress. For example, here are the subject headings for Khan's book Privilege:
Go to the Subject Heading Tips to see how you can use a main heading like Boarding schools to search for specific treatments of this topic.