The performance of ground observers in detecting, recognizing, and estimating range to low-altitude aircraft

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088	⊔	⊔	‡aHumRRO TR 66-19
100	1	⊔	‡aWright, A. Dean.
245	1	4	‡aThe performance of ground observers in detecting, recognizing, and estimating range to low-altitude aircraft ‡cby A. Dean Wright.
260	⊔	⊔	‡aAlexandria, Virginia, ‡bHuman Resources Research Organization, ‡c1966.
300	⊔	⊔	‡a1 v.
538	⊔	⊔	‡aMode of access: Internet.
710	2	⊔	‡aHuman Resources Research Organization.
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