Unlike European books where you can find 200 year old books in excellent shape due to excellent materials, paper, binding materials, a very thorough tradition of publishing and a dry climate. With Hebrew books from Eretz Israel - Palestine its an entirely different story. Because of the years of depression and poverty, binding materials and papers were of the lowest quality. Additionally, with the humid unstable climate, you get pages which are entirely foxed, tanned and yellowish, even if they are only 60-80 years old. Further, the fact that Israel was a newly born immigration state where refugees from WW2 were gathered to create a new nation, book preservation was not much on the list.