A Mini-Landscape of Exact MSSM Spectra in Heterotic Orbifolds
  We explore a ``fertile patch'' of the heterotic landscape based on a Z_6-II orbifold with SO(10) and E_6 local GUT structures. We search for models allowing for the exact MSSM spectrum. Our result is that of order 100 out of a total 3\times 10^4 inequivalent models satisfy this requirement. 
Oleg Lebedev, Hans Peter Nilles, Stuart Raby, Saul Ramos-Sanchez,   Michael Ratz, Patrick K.S. Vaudrevange, Akin Wingerter