OpenTwo archives, queried live.
Every record below comes from The Met or Smithsonian Open Access and was filtered on that archive’s own rights field before it reached this page. 12 shown for “Airway route map of U.S.” — 41 records examined, 20 dropped by the rights gate.
Archives queried 2026-09-01 11:12 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Airway route map of U.S.
Artist not stated in the record · 1935
World map with airmail routes
Artist not stated in the record · 1919-1950s
Post route map of New Jersey
Artist not stated in the record · 1917
Post route map of the Territory of Alaska
Artist not stated in the record · 1928
Post route map signed by Charles Lindbergh
Artist not stated in the record · 1928
Church Street letter sorting unit 24D-3
Artist not stated in the record · September 11, 2001
Post route map of Maryland, Delaware, and D.C.
Artist not stated in the record · July 1917
Chromolithograph of "Mission and Plain of San Fernando"
U.S. War Department · 1856
Chromolithograph of "Metamorphic Rocks-Borders of the Desert"
U.S. War Department · 1856
Chromolithograph of "Great Basin from the Summit of Tejon Pass"
U.S. War Department · 1856
Chromolithograph of "Los Angeles"
U.S. War Department · 1856
Chromolithograph of "Mirage on the Colorado Desert"
U.S. War Department · 1856
Where these records came from.
Two archives are wired, and only two. Each one is filtered on its own rights field — never on a title match, and never on the presence of an image file.
- The Met Collection API (Open Access)Rights field:
isPublicDomain. 1 matched · 1 examined · 1 dropped by the rights gate. Kept only where isPublicDomain === true and a file URL was published.0 shown - Smithsonian Open Access API (api.si.edu)Rights field:
content.descriptiveNonRepeating.metadata_usage.access. 2898713 matched · 40 examined · 19 dropped by the rights gate. Kept only where metadata_usage.access === "CC0" and an image resource was published.12 shown
These figures describe the pass run at 2026-09-01 11:12 UTC, during this request. A completed pass is kept for 24 hours and replayed for an identical search, which is what keeps repeated queries inside Smithsonian’s 30-requests-per-hour allowance. A pass in which either archive failed to answer is never kept — an outage must not be replayed as though it were a finding about the catalogue.
Wikimedia Commons and the Library of Congress are deliberately not wired. Wikimedia was confirmed, on a live query, to return CC-BY material inside the same result set as genuine public domain works, and filtering it safely has not been designed yet. loc.gov was blocked by bot detection during the source evaluation, so its rights vocabulary has never been observed — and nothing here is built on a field nobody has read.
An image file is a rights claim. It never travels without its field.