Columbia University

CLIO Library Catalog Open Data

Columbia University Libraries publishes its full catalogue — bibliographic and holdings records from the integrated library system behind CLIO — as gzipped MARCXML bulk extracts under a CC0 1.0 Public Domain Dedication, refreshed monthly, alongside a deletes file. 108 files were present in the extract directory at probe time, served from an open Apache directory index with no credential and no rate limit. Covers books, serials, music, video and manuscripts; excludes Law Library and ReCAP partner records. There is no manifest, no checksum, no change feed and no harvesting protocol — a consumer diffs the directory listing.

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API entry from apis.yml

aid: columbia:clio-opendata
name: CLIO Library Catalog Open Data
description: Columbia University Libraries publishes its full catalogue — bibliographic and holdings records
  from the integrated library system behind CLIO — as gzipped MARCXML bulk extracts under a CC0 1.0 Public
  Domain Dedication, refreshed monthly, alongside a deletes file. 108 files were present in the extract
  directory at probe time, served from an open Apache directory index with no credential and no rate limit.
  Covers books, serials, music, video and manuscripts; excludes Law Library and ReCAP partner records.
  There is no manifest, no checksum, no change feed and no harvesting protocol — a consumer diffs the
  directory listing.
humanURL: https://library.columbia.edu/bts/clio-data.html
baseURL: https://lito.cul.columbia.edu/extracts/ColumbiaLibraryCatalog/full/
tags:
- Library
- Catalog
- MARCXML
- Open Data
- Bulk Download
- CC0
properties:
- type: Documentation
  url: https://library.columbia.edu/bts/clio-data.html
- type: GitHubRepository
  url: https://github.com/cul/clio-spectrum
- type: Lifecycle
  url: lifecycle/columbia-lifecycle.yml
x-operator: institution
x-operator-evidence: lito.cul.columbia.edu resolves to lito-apache-prod2.cul.columbia.edu / 128.59.222.64,
  in Columbia University Libraries' own address space. The extracts are generated from Columbia's own
  ILS and released under Columbia's own CC0 dedication.
x-access: public
x-status: 200, 108 extract files listed, probed 2026-08-19