Conservation and Linen backing specialists. Chicago Poster Restoration, formerly Poster Plus Conservation, specializes in the conservation, restoration and linen backing of vintage, antique and collectible posters.  Chicago Poster Restoration work is represented in the collections of the Art Institute of Chicago, the Pritzker Military Library, The Yale Center for British Art, The Chicago History Museum, The Polish Museum of America, The Library of Congress, and the Tibbals Learning Center of the Ringling Museum and important private collections.