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L-19A (Cessna 305A) - Initial production version for United States Army, redesignated O-1A in 1962, 2486 built.
TL-19A - L-19As converted to dual control trainers, redesignated TO-1A in 1962.
XL-19B - L-19A with a 210shp XT-50-B01 engine, one built.
XL-19C - 19A with a 210shp XT51-T-1 engine, two built.
TL-19D (Cessna 305B) - Instrument trainer version of the L-19A with dual controls, redesignated TO-1D in 1962, 310 built.
L-19E (Cessna 305C) - Improved version of the L-19A with equipment changes and higher gross weight, became O-1E in 1962, 469 built.
OE-1 - 60 L-19As delivered to the United States Marine Corps, redesignated O-1B in 1962.
OE-2 (Cessna 321) - Redesigned version of the OE-1 with Cessna 180 wings and remodified fuselage, became O-1C in 1962, 27 built.
O-1A - L-19A redesignated in 1962.
TO-1A - O-1As converted as trainers.
O-1B - OE-1 redesignated in 1962.
O-1C - OE-2 redesignated in 1962.
O-1D - A number of TO-1Ds converted for Forward Air Controller duties with the United States Air Force.
TO-1D - TL-19D redesignated in 1962.
O-1E - L-19E redesignated in 1962.
O-1F (Cessna 305E) - Forward Air Controller conversions of the O-1D for the USAF.
O-1G (Cessna 305D) - Forward Air Controller conversions of the O-1A for the USAF.
SIAI-Marchetti SM.1019 - Turboprop variant for the Italian Army
Sources:
Wikipedia: O-1 Bird Dog
WARBIRDS RESOURCE GROUP > VIETNAM > PREVIOUS PAGE