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Found the info here http://www.nofma.org/installation.htm
the most useful.
The method I use must accommodate differing woods, colors and widths (and grains) of hardwood attached to "sleepers" placed on top of layer(s) of rigid foam - the subfloor is open to below (the critters would use any insulation beneath the subfloor for their own purposes) - so the fasteners must be on a line with the sleepers. I'll start by drilling the hardwoods for the spacing of the sleepers and face nail (2 abreast on the 3-1/4", more on the wider boards), then use a nail punch (drift) to sink the nail head below the surface, and mix and match colors in a wood putty to fill the holes. Some screws may be needed in places, but I'll try to keep those to a minimum by using some body English with the hammer and maybe the angle of the drilled hole. The 3/4" thick hardwood has far more holding power than that of the fir or pine sleeper so the drilled hole can be just a bit less than the nail shaft and just a fuzz more than the nail head. I'll first try a long finishing nail (will have the 1-1/2" of the 2x4 sleeper to hold the nail). I wouldn't suggest this to others - the project is my retirement home - rustic, 100% DIY, off-the-grid (PV), fallen trees used for posts, etc. - perfection would be out of place. I might not even attempt to sand it completely level if the board thicknesses vary much. Well, I can always change my mind as I go -"yer outhouse fits yer boards."
Perhaps you may find something here useful: http://www.cinhome.com
particularly alternatives to solvent-cleanups and fumes - here's another water-base wood putty: http://www.cheyennesales.com/catalog/behwoodfil.htm
I certainly do wish you luck - and that certain kind of enjoyment that goes with working with old wood - and please post back with your experiences and comments.