Aircraft identity

Date:         16 Mar 2001 05:56:18 
From:         "Stephens Lyle E" <StephensLyleE@JohnDeere.com>
Followups:    1 2
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I'm trying to identify two aircraft in a photo taken at Moline, IL in the
1930's. The registrations numbers are NC726K and NC727K. Both aircraft have
2 of almost everything: wings, engines, fins and rudders, stabs and
elevators. Is there a historic registration database I can consult?