What are those languages? Estonian, Davvin Sami, I suppose.
The languages in the book are Mansi, Komi, Udmurt, Khanty, Estonian and Sami. The annoying thing is that the author grouped all Sami languages into one, so most probably under "Sami" he means Northern Sami.
Does your book agree that it's easy to postulate an older state of these languages with the vowel harmony? I've heard that but never found any justification.
Yes. It says that Proto-Uralic had front and back vowels and vowel harmony.
Another thing is that Proto-Uralic maybe had three manners of articulation, unlike the modern languages. Only the closed and the open vowel agreed vowel harmony, so it seems to me that the phenomenon has got stronger in Finnish and Hungarian, at least.
I never encountered this theory. Can you explain further?
Udmurt has the stress on the last vowel, and Komi has it on the last full vowel, if I remember right what languages they were.
Also Mari has not-initial stress pattern. It says that Hill Mari has mostly penultimate stress, but Meadow Mari has no fixed stress.
Sami has odd sC klusters, for example the name of Skolt Sami is really Skolt.
Sami languages are strange in general. There is little information about them out there, which is sad.