Reading through the Anchor Bible Dictionary and continually come across a reference to "M.R.: with six digits, i.e. "... located in the NE Shephelah (M.R. 147128) in the Valley of Sorek and which ..."
Fredric Brandfon, “Beth-Shemesh (Place),” ed. David Noel Freedman, The Anchor Yale Bible Dictionary (New York: Doubleday, 1992), 696.
It is safe to assume that M.R. refers to a map reference. My question is which map system is being used? I have missed any explanation in the Dictionary that offers an explanation. Does anyone have a clue or guidance to point me in the direction to the system that is being referenced? Thank you.