Abbreviations in Anchor Bible Dictionary

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.
Comments
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Also called grid reference:
https://en.wikipedia.org/wiki/Grid_reference
There are both 4 and 6 systems:
https://study.com/academy/lesson/grid-references-4-figure-6-figure.html
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Dean J. Ferguson said:
Does anyone have a clue or guidance to point me in the direction to the system that is being referenced? Thank you.
See this link.
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