Cooper Hewitt object type
Sketchbook folio records.
These 4 released pages each report one exact object ID from the current official collection record.
Quick answer
4 released records identify their object type as Sketchbook folio.
Sketchbook folio - 1810–20Sketchbook Folio, Ecstasy of St. Theresa after Circle of Francesco Albani, 1810–20
Object 18123937
Sketchbook folio - 1885–90Sketchbook Folio, Small Study of Many Trees, 1885–90
Object 18396371
Sketchbook folio - 1885–90Sketchbook Folio, Unfinished Cliff Study, 1885–90
Object 18396409
Sketchbook folio - 1870–85Sketchbook Folio, Countryside with Many Trees, 1870–85
Object 18396681
What this answer proves
One object ID appears in one official museum record.
One stable Cooper Hewitt object identifier owns one page. The page reports only structured object facts present in the museum's versioned collection record.
Source and image boundaryCollection metadata is released as CC0. Images are separately governed; selected records are limited to rows the museum marks as having no known copyright, and ObjectLore does not claim that flag is a legal determination.No match, a removed record, or an unavailable source is inconclusive. It does not prove that the museum lacks the object, that the object is not copyrighted, or that no other catalog record exists.