Consignors and sellers often wish to remain anonymous, and few private collections have been published.
Other strategic loans to fill occasional historical gaps remind us of the amazing old-master paintings still in private collections.
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Other undiscovered letters understood to be held in libraries and private collections around the world are being searched for.
So is amassing one of the world's largest private collections of contemporary art.
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Pyne's work remains highly prized and features in many public and private collections.
Judaica said to be among the most valuable private collections in the world.
On loan from major museums and private collections are paintings by such major British landscapists as John Constable and J.
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Carefully assembled from private collections, the exhibition made a firm statement against the conservatism of public gallery culture of the same period.
It included no fewer than 70 paintings and 30 drawings, many of them on loan from public and private collections around the world.
The gallery was to have been filled with artworks looted across Europe by the Nazis from museums and private collections, many of them Jewish.
These particular dinosaurs are in the university's museum, but they are bucking a trend: More and more fossils are ending up in private collections--including Myhrvold's.
Private collections by wealthy families are also being rapidly sold off.
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He treats Italy like his own private attic, coaxing a few famous but mostly obscure old masters out of private collections, regional museums, palaces and churches.
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The demand is as large as the Chinese population and economy, and supply of exquisite objects limited, thanks to most being in Western museums or private collections.
"A large amount of private collections have been put in the record office with the presumption that they would be freely available to the public, " he said.
Of the 71 paintings in a new exhibition in London, 21 come from his native Copenhagen, 15 from other Scandinavian collections and 20 from private collections, principally Danish.
It is doubtful that the concentration on less-well-known pictures (many of them seldom-seen loans from private collections) will convince people that Bonnard is, as Ms Amory claims, a modernist.
Circle will include a selection from various private collections.
Sadly, though, while the following list of the world's greatest post-war art thefts reveals that most of the work stolen from museums, galleries and private collections has been returned, many are still missing.
"I wanted to produce a book that would be so rare, so cherished and so well received that 500 years from now it will be in museums and in private collections, " Cheers explained.
The statement added that several species of rhino have been "brought to the edge of extinction" due to poaching in the wild, so in recent years thieves have begun to target museum and private collections.
The current wild beaver populations in Scotland either belong to the government-licensed Scottish Beaver Trial in Knapdale in Argyll, or are the descendants of escapees from private collections in Angus and Perthshire over the past decade.
Most of them were returned after 1815, but the French royal collection remained accessible in the Louvre, and it was in England, with spectacular private collections but no national gallery, that old-master exhibitions were first established.
The city boasts an impressive array of ancient monuments and priceless artefacts, including its striking earthen mosques -- made from mud and wood -- and a vast trove of scholarly manuscripts held in public and private collections.
Though the conservator who helped to reveal the painting's true identity called it "the rarest thing imaginable, " speculation is rife that there are other Leonardo da Vinci paintings still at large, possibly lying unknown in private collections.
Spirit of the 20th-century Parisian Scene (until 9 June) features 150 of his works, many from private collections, as well as 80 works by artists that he was said to have inspired, including Pablo Picasso, Henri Matisse and Andy Warhol.
Drawn primarily from the Alexander McQueen Archive in London, with some pieces from the Givenchy Archive in Paris as well as private collections, signature designs including the bumster trouser, the kimono jacket, and the Origami frock coat will be on view.
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By the 1980s, when the Getty Museum began to hoover up old private collections including one belonging to Sam Wagstaff, a legendary collector with an original eye and a personal fortune collectors and curators all had to know exactly who was who, and who had changed the medium.
More than 50 paintings spanning Manet's career have been collected from around the world, from both public collections and private owners.
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