Chris
A few numbers to go with your "unknowns"
Your J3C-65 dated 1969 Santee, SC.
http://www.airport-data.com/aircraft/photo/455128.html
N2072M is c/n (msn) 20849 which is currently registered as N5MB.
Data from FAA registry microfiche (1975,1976,1977).
Pima Museum C-140B -Stored frame-
http://www.airport-data.com/aircraft/photo/444921.html
is ex USAF 62-4200 c/n (msn) 1329-5044 or simply 5044.
Modified L-5 biplane sprayer. (Used in late 60s by Clovenger Company)
http://www.airport-data.com/aircraft/photo/265354.html
N69083. It was de-registered during the 70's and re-registered in the 80's.
I believe the c/n (msn) is 76-017 (no military serial tie-up)
I have several negatives of the Clovenger sprayers. Will have to dig them out and scan...
Corsair at Ontario CA. 1970
http://www.airport-data.com/aircraft/photo/273264.html
N3466G c/n (msn) 3393 and USN BuNo 92132
The giveaway clue to is #29 under wings. N3466G flew with those marks.
John