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- 61012376 contributor B1481114.
- 61012376 created "[1961]".
- 61012376 date "1961".
- 61012376 date "[1961]".
- 61012376 dateCopyrighted "[1961]".
- 61012376 description "Includes bibliography.".
- 61012376 extent "54 p.".
- 61012376 issued "1961".
- 61012376 issued "[1961]".
- 61012376 language "eng".
- 61012376 publisher "Washington, National Council of Teachers of Mathematics".
- 61012376 subject "Arithmetic.".
- 61012376 subject "Ciphers.".
- 61012376 subject "Matrices.".
- 61012376 subject "QA145 .P4".
- 61012376 title "Secret codes, remainder arithmetic, and matrices.".
- 61012376 type "text".