https://www.everand.com/audiobook/1035846204/The-Invisible-Industry-History-of-trade-shows-in-the-USA The Invisible Industry is the history of how trade shows started in the USA.Beginning with World Fairs, the concept of trade shows evolved worldwide.Trade shows unfolded in the USA in 1900 and evolved The Invisible Industry: History of trade shows in the USA https://imgv2-2-f.scribdassets.com/img/audiobook/1035846204/original/183x250/bb2fa05ddc/1778611011?v=1 weekly 1.0