Unknown Affiche Ancienne 宾夕法尼亚州卫生部原版的宾夕法尼亚州反污染运动宣传海报--好水守护生命：好水拯救地下水供应。为了生活，为了生计，请保持溪流清洁。- 图案为田野、农场和远处山丘上的云朵。出版于宾夕法尼亚州哈里斯堡。状况尚可，有污渍、折痕、撕裂、胶带痕迹、纸张破损。发行国：美国美国, 设计者：尺寸（厘米）：55x3955x39，印刷年份：1950s.

Composed of several subsidiaries, the Drouot Group is a major player in the art market. Hôtel Drouot, located in the heart of Paris, has been the world's largest public auction center since 1852. 15 salerooms are available to more than 70 auction houses. The emulation generated by an annual offer of 230,000 artworks from 21 major specialities - from Antiquity to street art - attracts some 3,000 visitors every day. The Group's digital platform, Drouot.com, offers digital sales - Live auctions (live broadcasting and participation in auctions), Online-only auctions (dematerialised auctions) and Buy Now sales (sales of lots at fixed prices). Nearly 2 million items are offered annually by 600 auction houses. Auction news is reported every week in La Gazette Drouot, the leading weekly magazine for the art market and culture published by Auctionspress.