Think the mark eg set & chris liberator set was from nsa 11 which is pretty good.
That m-zone & mark eg set im struggling with. Far as im concerned there 1st b2b on the nsa series was nsa 12 which was in 1999.
But the m-zone & vortex set is prolly from nsa 29 which is a belter if your into the hard trance early hardstyle sound.
Id get it if i were you (and upload them on here too ;) )