I'm doing this from memory since I'm not at home in front of my library.
Phalaenopsis -A monograph- Eric Christienson
the modern day taxonomic authority on phals.
Angraecoid Orchids- Joyce Stewart
an excellent modern review of this group.
Sander's Orchid Guide- from 1927. A very interesting guide to growing and older taxonomy.
I'm forgetting more than a few.....
Cribbs monographs on paphs and cymbidiums...
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