README.md

---
license: cc0-1.0
task_categories:
- text-generation
size_categories:
- 10B<n<100B
language:
- en
tags:
- books
- public domain
- internet archive
- openlibrary
- ocr
- open culture
pretty_name: Internet Archive Public Domain Books (English)
---
# Internet Archive Public Domain Books (English)

This dataset contains more than 650,000 English public domain books (~ 61 billion words) which were digitised by the [Internet Archive](https://archive.org/details/books) and catalogued as part of the [Open Library](https://openlibrary.org/) project. The dataset was compiled by [Sebastian Majstorovic](https://www.storytracer.org).

## Dataset summary

The dataset contains 653,983 OCR texts (~ 200 million pages) from various collections of the Internet Archive (IA). Books in the IA can be distinguished from other types of documents by checking whether an IA item is linked to an Open Library (OL) record. Only texts with an OL record have been included in this dataset in order to restrict the dataset as much as possible to books.

## Curation method

In order to reliably find public domain books among the IA collections, the dataset was curated by combining three approaches:
1. Manually identifying IA collections which expliclity state that they exclusively contain public domain materials, e.g. the [Cornell University Library collection](https://archive.org/details/cornell/about?tab=about) and downloading them in bulk.
2. Using the [possible-copyright-status](https://archive.org/developers/metadata-schema/index.html#possible-copyright-status) query parameter to search for items with the status `NOT_IN_COPYRIGHT` across all IA collections using the [IA Search API](https://archive.org/help/aboutsearch.htm).
3. Restricting all IA searches with the query parameter `openlibrary_edition:*` to ensure that all returned items posses an OpenLibrary record, i.e. to ensure that they are books and not some other form of text.

## Size

The size of the full uncompressed dataset is ~400GB and the compressed Parquet files are ~220GB in total. Each of the 327 Parquet files contains a maximum of 2000 books.

## Metadata

The book texts are accompanied by basic metadata fields such as title, author and publication year, as well as IA and OL identifiers (see [Data Fields](#data-fields)). The metadata can be expanded with more information about subjects, authors, file details etc. by using the [OL API](https://openlibrary.org/developers/api), [OL Data Dumps](https://openlibrary.org/developers/dumps) and the [IA Metadata API](https://archive.org/developers/md-read.html).

## Languages

Every book in this collection has been classified as having English as its primary language by the IA during the OCR process. A small number of books might also have other languages mixed in. In the future, more datasets will be compiled for other languages using the same methodology.

## OCR

The OCR for the books was produced by the IA. You can learn more about the details of the IA OCR process here: https://archive.org/developers/ocr.html. The OCR quality varies from book to book. Future versions of this dataset might include OCR quality scores or even texts corrected post-OCR using LLMs.

## Data fields

| Field | Data Type | Description |
| --- | --- | --- |
| ocaid | string | IA [item identifier](https://archive.org/developers/metadata-schema/index.html#identifier), included in the [IA item URL](https://archive.org/developers/items.html#archival-urls) |
| title | string | IA metadata field [title](https://archive.org/developers/metadata-schema/index.html#title) |
| author | string | IA metadata field [creator](https://archive.org/developers/metadata-schema/index.html#creator) (multiple values concatenated by semicolon) |
| year | int | IA metadata field [year](https://archive.org/developers/metadata-schema/index.html#year) |
| page_count | int | IA metadata field [imagecount](https://archive.org/developers/metadata-schema/index.html#imagecount) |
| openlibrary_edition | string | OL [edition](https://openlibrary.org/dev/docs/api/books#:~:text=Learnings%20about%20Works%20v%20Editions), referenced from IA metadata field [openlibrary_edition](https://archive.org/developers/metadata-schema/index.html#openlibrary-edition) |
| openlibrary_work | string | OL [work](https://openlibrary.org/dev/docs/api/books#:~:text=Learnings%20about%20Works%20v%20Editions), referenced from IA metadata field [openlibrary_work](https://archive.org/developers/metadata-schema/index.html#openlibrary-work) |
| full_text | string | Content of the IA item's [plain text OCR file](https://archive.org/developers/ocr.html?highlight=djvu%20txt#additional-generated-content) ending in `_djvu.txt` |

## Copyright & License
The full texts of the works included in this dataset are presumed to be in the public domain and free of known copyrights in the United States by the institutions who have contributed them to the collections of the Internet Archive. It is the responsibility of the dataset user to comply with the copyright laws in their respective jurisdiction. The dataset itself, excluding the full texts, is licensed under the [CC0 license](https://creativecommons.org/public-domain/cc0/).