Fantastic photo collection, especially the General Aviation (Clark) GA-43 floatplane, c/n 2205, C-90 “BOLIVAR” in a hangar (operated by SCADTA on river Rio Magdalena, Colombia)

You can find a sideview of the Colombian registered floatplane C-90 here
http://www.jeffphillippiphoto.smugmug.com/Posters/Others/6264710_s7GZnK/2/276884959_M3E4c#276884959_M3E4c-XL-LB