Ken tells me that Gary Neff's clip of the 16-mm landing film is linked at: http://www.hq.nasa.gov/alsj/a12/video12.html

I was referring to this footage:

http://www.darkstar1.co.uk/surv3.rm

"How did the Apollo 12 crew manage to capture footage of the Surveyor
III craft that had landed at their landing site in April '67. Anyone
who watches the film will be astonished how skilfully they managed to
capture the sequence through such a small window, and whilst trying to
land their own craft. The Lunar Lander does a 360 degree turn around
the Surveyor III and not once does it go out of focus or move out of
shot. Was this sequence shot out of an open door of a helicopter?
Readers will be interested to know that a sceptic accused that this
wasn't NASA footage? beats me too!" -Cosmic Dave / Aulis

I'll check out 'Conquest of Space'...