If you can be certain to find a line between rows of nails, you could set your circular saw to (a shy)1/4"and cut a trench to allow you to get under the floor and pull it up.Around here it is very common in old houses (Second Empire, Queen Anne, etc) to have accumulated 3-4 layers of flooring over the years  - we renovated one two summers ago which had an original pine floor over the subfloor; two layers of hardwood above that and, in places, a layer of asphalt tile on top of the hardwood.  

Pretty much all of the offering circulars state this as do the operators of the sites.  

There had been a minor slide in 1973 involving about 10 to 12 feet of the filled slope, and another major slide in 1975 where the fill dropped eight to 10 feet in a circular shape 50 to 60 feet across.

Adjust based on feedback.The second step is to organize yourself legally with an operating agreement, offering circular, and subscription agreement. 

My 7 1/4 circular saw is HF, too, but almost all the blades I use in it are Diablo.Only some exceptions to this in my experience: don't buy a cheap caulking gun, staple gun, screwdriver with a set of 1/4 bits, or a cheap plastic razor utility knife.

The market risks and other systemic risks are likely to be outlined in the offering circular, but understanding the capital account structure and how the deal is structured is probably something worth getting a professional to help you with.  

Get a circular saw, set if for the thickness of the subfloor.

I tried to find a point in here, in all this vacillation and circular ambiguity and conjecture, all I can find is trolling for trolling sake.

The compressor units for mini splits are awesome- quiet, power savvy, and small, you can tuck them in and hide the easily.  3) I'm not HVAC experienced, other than casual interest, but I've seen on This Old House the installation of smaller 4" ducts that run to a smaller room "port" that is circular, instead of a big vented rectangle.  

@Anthony TranYou will run into what is called circular legislation.