You can make simple cascode stacks with discrete Rs
and transistors to drop the headroom in smaller bites,
but dropping this much voltage in a linear regulator is
certain to be wasteful and also give you a lot of waste
heat to manage.
Much better to drop all but 3V in a switcher, and run
your linears off (say) 18V - if you need the linears' low
noise; otherwise, just get a dual output 48V (telecom)
+/-15V output switcher and move on to whatever the
real project is.