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Cunliffe, Robert H.: Spink/Shreves Galleries, Juni 2009, Teil 1: Spectacular Inverted Stamps of the United States & Possessions, Teil 2: Spectacular Inverted Stamps of the World, 2 Luxus-Hardcoverbände im Schuber; außerdem: Civil War. Sesquicentennial Sale, Spink-Auktion 12.4.2011, Dallas
Cunliffe, Robert H.: Spink/Shreves Galleries, June 2009, Part 1: Spectacular Inverted Stamps of the United States Possessions, Part 2: Spectacular Inverted Stamps of the World, 2 luxury hardbound volumes in slip-in case, also: Civil War. Sesquicentennial Sale, Spink auction 12.4.2011, Dallas