There is a fairly strong chance it has some in it. Place where I can think of is if it has/had a old tile floor the tiles or the adhesive were made of asbestos. They are fairly easy to spot IE black tar like adhesive and the tiles are typically 9x9. As long as it's sound and not friable IE broken up and possibly airborne it's not really an issue. Most old homes have it. In that case as long as the subfloor is in AOK shape you just throw 1/4" plywood on top, staple it down, and lay your new floor. Here is some info. http://inspectapedia.com/sickhouse/asbestoslookB.htm. As far as anything else I'm not sure and somebody else will chime in if there is something I'm unaware of.