What type of floor is this, how to care for it?

The kitchen in our house looks to be about 1950's vintage (O'Keefe & Merrit stove etc.). I don't understand what material the floor is made of and how to best care for it. When we bought it in 2006 it looked amazingly smooth/shiny and blemish free. We've been using mop and glo on it and its held up ok, but has become noticeably dull and scuffy. If a puddle of water is ever left on the floor it seems to seep in and dry to a hazy white spot which eventually goes away on its own (wax?). Is this this vinyl or linoleum (I've never had either)? When we first moved in it seemd to have a finish or patina that made it very resistant moist bits of food drying/crusting onto the floor. However now it is to the point where the whole floor feels 'rough' to a bare foot, and small piece of chopped vegetable that is accidentally un-swept and mooshed into the floor will dry to an annoying rough bump that is nearly cement like to get rid of. Do you have an idea of what this floor is made of and how we should really be caring for it? As 'ugly' as it is- I actually have grown to love the pattern so I'd like to figure out a way to make it last:)