LCSH mirror: https://bibliotecaalonsocossio.com/lcshmirror/

Every Library of Congress Subject Heading as a MARC authority record,
taken from id.loc.gov and rebuilt weekly. Unofficial; not affiliated with
or endorsed by the Library of Congress. Data: public domain (CC0).

Current release: 2026-11-07, 468,352 records
Since 2026-11-06: 150 new, 1 changed, 1 deleted.

  lcsh-20261107.mrc.gz             58 MB  MARC 21
  lcsh-20261107.mrcxml.gz          56 MB  MARCXML
  manifest-20261107.csv.gz          8 MB  CSV
  changes-20261107.mrc.gz          59 KB  new or changed, MARC 21
  changes-20261107.mrcxml.gz       58 KB  new or changed, MARCXML
  changes-20261107.csv.gz           3 KB  new or changed, CSV
  deleted-20261107.csv.gz        88 bytes  deleted, CSV

*-latest.* always point to the current release. changes-* hold only the records
new or changed since the previous release; deleted-* lists headings removed since then.

Verify:   sha256sum -c SHA256SUMS
Read:     MarcEdit > MarcBreaker (.mrc -> .mrk)
Feed:     releases.atom
Archive:  https://archive.org/search?query=identifier%3Alcsh-mirror-%2A
Code:     https://github.com/iratedemon04/lcsh-mirror