24 of the A-29-LOs which had been retained by the USAAF were
converted into photographic survey aircraft under the
designation A-29B-LO.
Sources:
-
Lockheed's Made-Over Bomber, Freeman Westell, Wings, Vol 26, No. 6,
p. 46 (1996).
-
Lockheed Aircraft Since 1913, Rene J. Francillon, Naval Institute
Press, 1987