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Sign at the main entrance to the Prologue Room. It reads

Boeing
James S. McDonnell PROLOGUE ROOM
Air & Space History Exhibit

Below is the original request for proposal for the DC-1, which ultimately evolved into the DC-3 and subsequently the C-47 Skytrain/Gooney Bird.

Time picture taken	Wed Aug 22 12:08:06 2018
Location picture taken	James S. McDonnell Prologue Room Entrance Boeing Building 100 St. Louis, MO
Picture also in	DC-1 Request for Proposal