Here are some more musings on the ground resolution (since the actual numbers have been redacted quite inconveniently):
Fig. 5 in The KH-8B Camera System (Doc #17 in the GAMBIT folder) visualizes the KH-8B primary camera (175.6" focal length) frame coverage, which results in a 3.4 nautical mile (6,300 meter) wide swath. Fig. 7 shows that the main image is projected on a 8.811" (223.8 millimeter) wide portion of the film. This yields a ratio of ground coverage to film width of 6,300 meter / 223.8 millimeter or 28.15 meter / millimeter.
The GAMBIT Story has a section on GAMBIT Films (page 85):
Developed by Kodak … these films evolved from the original Type 3404, through Type 1414 high-definition film, SO-217 high-definition fine-grain film, and a series of films called "mono-cubic dispersed" or "monodispersed,", on which silver-halide crystals were very uniform in size and shape, providing significantly improved film speed and resolution. SO-315 contained silver-halide crystals of the order of 1,550 angstrom units in dimension, in SO-312 the size was reduced to 1,200, and in SO-409 to 900 angstrom units.
Kodak's technical data for Type 3404 quotes a resolving power of 50 to 100 line pairs per mm. Hence with the lowest resolution film, KH-8B could have achieved a resolution as good as 30 to 60 cm (1 to 2 ft). Using a film with a resolution equivalent to Kodak's Type 3414 AERECON High Altitude Film with a resolving power of 320 to 630 line pairs per mm would have enabled KH-8B to sample a ground resolution of 5 to 10 cm (2 to 4"), i.e. in the same order as the best resolution of 2.3"(?) Dwayne heard about.