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Q2: What are the HTRC tools and services?

A:  The The HTRC has created a suite of tools that allow researchers to perform text analysis on content in the HathiTrust Digital Library. These tools include the Portal and Workset BuilderMost of these tools are available via HTRC Analytics, and include web-based text analysis algorithms, HathiTrust+Bookworm, and the HTRC Data Capsule. They are intended to meet the needs of various HTRC researchers.

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  • HTRC Algorithms: a set of tools for assembling collections of digitized text and performing text analysis on them.

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  • HathiTrust+Bookworm: a tool for visualizing and analyzing word usage trends in the HathiTrust Digital Library.

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  • HTRC Data Capsule: a secure computing environment for performing researcher-driven text analysis on HathiTrust content. 

Q3: How do I use the HTRC?

A: You use the HTRC by interacting with our tools and services. Please refer to the documentation for each tool or service for more specific how-to guides.

Q4: Do I need an account to use the HTRC and how do I make one?

A: Most of the HTRC services require an account to log in and interact with the tools, though HathiTrust+Bookworm is available without an account.

Register for an account by going to the main page of the Portal HTRC Analytics and choosing "Sign up" from the menu. Anyone possessing an email address from a nonprofit institution of higher education is allowed to register, including those whose institutions are not HathiTrust members. 

Q5: What is the difference between using the HTRC and searching the HathiTrust Digital Library?

A:  Using Using the search bar on the hathitrust.org site allows , you to can find digitized items in the HathiTrust Digital Library (HTDL) and to read them if they are in the public domain. From the HTDL, you can create collections that you are able upload to HTRC Analytics as a workset. With the HTRC tools you can instead work with material in from the HathiTrust Digital Library at scale, using computational methods to analyze subcollections collections of content, called worksets in HTRC, relevant to your research.

Q6: What types of data and metadata does HTRC provide?

A:  The availability of data and metadata in HTRC depends on the tool or service.  

  • HTRC algorithms and HTRC Data Capsules currently provides access to a snapshot of the public domain corpus OCR text from

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  •  HathiTrust, as well as each

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  • volume’s MARC bibliographic

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  • and METS metadata.Both the HTRC algorithms and Capsule-environments draw from the HTRC Data API described below.

  • The HTRC makes available also two datasets,

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  • HTRC Extracted Features includes metadata and extracted page-level data (words and word counts) for 13.7 million volumes.

  • HathiTrust+Bookworm visualizes data for 13.7 million volumes.


Q7: What is the difference between the HTRC Data API and HathiTrust datasets and APIs?

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 HTRC Data APIHT Data API
purposeto serve high-performance large-scale algorithms and programsto provide public users some volume retrieval capabilities
throttling enforcementnoyes
securityOAuth2JWTOAuth
bulk retrieval of volumesyesno
metadata availableMETSMETS, MARC

Q8: What happened to the HTRC Solr Proxy API?

A: As the HTRC moves to update and improve its search and workset-building services, the Solr Proxy API has been retired. For now, you can search for HathiTrust volumes via the HathiTrust Digital Library interface. Look for improved functionality in the near future, and please reach out with your workset-building scenarios that require additional search functionality. 

Q9: How do I ask questions or start discussions with other users?

A: Please join the HTRC User Group mailing list.

  • Please send an email to htrc-usergroup-l-subscribe@listSubscribe here: https://list.indiana.edu to subscribe to the list, and then use /sympa/info/htrc-usergroup-l@list.indiana.edu to post questions.l
  • For questions that you want to discuss with us privately, please write to htrc-help@hathitrust.to htrc[dash]help[at]hathitrust[dot]org, a list subscribed by HTRC internal staff only.
  • All users are subscribed to a listserv called HTRC-Announce when they create an HTRC Analytics account.

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  • Only approved senders can send mail through this list.

Q10: How do I report issues or give feedback?

A: We welcome your feedback! Please You can send an email to htrc-help@hathitrust.org and we will be happy to talk more about your questions or concerns.

You can also report a bug on our JIRA instance. You will need to create an account to log into JIRA if you have not done so already. 

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to HTRC Support at htrc[dash]help[at]hathitrust[dot]org. We track support requests in using JIRA, and you can log-in to see your requests and our responses here: https://jira.htrc.illinois.edu/servicedesk/customer

Q11: Where do I go for more information?

A: If you have not found what you are looking for in our documentation, you might find the material posted to our Publications and Presentations page useful for further reading.

You might also consider attending a workshop. You can find information on future workshops on our calendar.

Or you can ask for further assistance on our mailing lists. See below for more information about signing up.