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. 14 shown for “Post route map of Maryland, Delaware, and D.C.” — 47 records examined, 23 dropped by the rights gate.
Archives queried 2026-09-01 13:32 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
A Cowherd at Valhermeil, Auvers-sur-Oise
Camille Pissarro · 1874
Post route map of Maryland, Delaware, and D.C.
Artist not stated in the record · July 1917
Landscape with a Cottage
Pieter de Molijn · 1629
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
World map with airmail routes
Artist not stated in the record · 1919-1950s
Airway route map of U.S.
Artist not stated in the record · 1935
New Hampshire and Vermont postal route map
Artist not stated in the record · 1912
Pictorial Map of the Seat of War, Showing Parts of the States of Maryland, Delaware, Virginia, and North Carolina, and also the Coast Line from Cape Henry to Fort Pickens, with the United States Blockading Fleet, from Harper's Weekly, June 8, 1861
Unidentified · 1861
“Map of the United States Exhibiting the Post Roads" by Abraham Bradley
Abraham Bradley · 1796
Rural Free Delivery wagon model
Terre Haute Carriage & Buggy Company · c. 1896- c. 1905
Photograph of interior of Trans World Airline (TWA) Skymaster
Artist not stated in the record · September 26, 1946
Rural Free Delivery self-inking pocket handstamp
Artist not stated in the record · June 4, 1902
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. 7 matched · 7 examined · 5 dropped by the rights gate. Kept only where isPublicDomain === true and a file URL was published.2 shown - Smithsonian Open Access API (api.si.edu)Rights field:
content.descriptiveNonRepeating.metadata_usage.access. 3176165 matched · 40 examined · 18 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 13:32 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.