(I have only read Yadin's book, so there may be other evidence I'm not aware of.)
Yadin's book was a bit premature and did, in fact, miss some of the Hebrew evidence that he was involved in uncovering. (Yadin was more of an archeologist than a linguist.) For a better picture see the articles by Kutscher (in Hebrew, 1961-62?), still excellent after 50 years, though now there are even more texts available. For English, you could read the article by Moshe BarAsher in the Compendia Rerum Iudaicarum series: The Literature of the Jewish People in the Period of the Second Temple and the Talmud, Volume 3 Literature of the Sages, CHAPTER 18: MISHNAIC HEBREW: AN INTRODUCTORY SURVEY by Moshe Bar-Asher. Breuer's article on Aramaic is chapter 19.
Again, dated but excellent is Kutscher's volume on the Isaiah Scroll. The study was done in 1959 and I picked up a copy in 1975 for $6. Those were the days, considering that an English version came out shortly afterwards and was asking close to $200. See, it pays to know Hebrew. You should be able to find/order this book in any large university reference library. My favorite survey of the languages and period is Abba Bendavid's first 150 pages in Leshon miqra ulshon Haxamim, 2vol, 1967. What has been strange to watch, and alluded to in Fassberg's article, is the very slow recognition of this kind of work within NT scholarship. Very compartmentalized scholarship. People playing with different sets of cards.