It's not an official document but I think the site's name is notable.
http://www.globalsecurity.org/milita...raft-early.htm
Quote:
During World War I (!!!), visual detection in daylight did not exceed 15 miles. Experiments with stealth capabilities occurred as far back as the early part of the 1900s when Germany tested an aircraft with a transparent wing, designed to make it difficult to spot by observers on the ground.
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Quote:
During WWII, The US Navy's Project Yehudi used lights mounted on the leading edges of the wings of a torpedo bomber to successfully hide the plane in broad daylight when attacking a submarine. Visual detection range in the tests dropped substantially from 12 to 2 miles.
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EDIT: About Project Yehudi, in the test they used an TBM 3D Avenger.
http://books.google.com/books?id=q06...bomber&f=false