For species info, the Orchid Culture series by Margaret and Charles Baker is unparalleled in its scope and thoroughness. There's a book on Dendrobium, one on the Oncidium/Odontoglossum tribe, one for a bunch of 'P' genera (Phalaenopsis, Phragmipedium, Pleione, and others), and a multi-part one co-written with Guido Braem on Paphiopedilum. You can buy individual culture sheets for lots of other species/genera at
Orchid Culture -- Charles and Margaret Baker, they'll even custom-generate them from available data if you're looking for something not on the list. Hope this helps!
--Nat