Preservation of the Hebrew Text

How was the hebrew text preserved? In this links below are some insight informations about the preservation of the hebrew text, the so-called Old Testament.:

• Internal Conditions of Hebrew Text (Old Testament)
• External Circumstances of the Hebrew Text (Old Testament)
• The Septuagint Version and the Hebrew Text (Old Testament)

All theses biblical studies were taken from the International Standard Bible Encyclopedia Edited by James Orr, published in 1939 by Wm. B. Eerdmans Publishing Co