heh. I guess... But this may shock you...
I dont think its overly important for a nail technician to study anything other than common nail disorders.
Why? Because if you see anything outside the scope of a common disease or disorder than you would need to refer it to a derm anyway.
These books are really stomache turning, written by derms who have a slightly warped perception of the commonality of nail disease and disorders.
That isnt a dig on derms as they are by far the most important professionals in our industry. I only say slightly warped because they seldom ever see anything besides really extreme diseases and disorders. That would warp anyones perception at least slightly!
In my opinion, books like Encyclopedia of nails and Nail structure and product chemistry are far more relevant to us as professionals.
If you want more info... take it the next level to 'The Nail in Health and Disease' by Nardo Zaias. Which is kind of the 'next step' to the other books I mentioned. But saying that, even that book is slightly dated as its 25 years old.
At the end of the day, these books can only help to enrichen your understanding of nails, but just take them all with the understanding of how very rare these cases really are (*gack* I just scanned Baran and Dawbers and honest hand on heart just about lost my Large Big Tasty Meal *gack*).
Anyhoo... just thought I would share my thoughts on the subject