Baker's 'Orchid Species Culture'. There are three of these books, 'Dendrobiums', 'Oncidium/Odontoglossum Alliance', and one that lists a lot of plants starting with 'P', which includes Phals, but not Paphs. I got 2 of these as used hardbound books, and the Oncidium as a pre-publication order for a price less than I paid for the others. You can look at Abes Books or Alibris, even Amazon for used copies. Also, there is a paper back version of some. The Onc and Den books are 1000 page wonders, and you should be able to get them for around $60 each. The other is the first of the Baker books published and is same size format (8.5 X 11?), but has a lot less pages. The information on each plant is incredible, and available no where else in one place. You can also get info on individual plants by buying a subscription to his sheets for a little less than a dollar apiece.
Orchid Culture - Charles and Margaret Baker
Check out the free sheets on this site. The monthly habitat weather info is worth the price of the sheets.