| 000 | 00452nam a2200157Ia 4500 | ||
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| 005 | 20220316144657.0 | ||
| 008 | 180710s9999 xx 000 0 und d | ||
| 020 | _a72310 | ||
| 082 |
_a371.3511 _bBAL _223 |
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| 100 | _aBALLARD, Philip Boswood | ||
| 245 |
_aTeaching the essentials of arithmetic / _c[by] Philip Boswood Ballard |
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| 260 |
_aLondon _bUniversity of london press _c1928 |
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| 300 | _axxi, 260 p. | ||
| 500 | _aIncludes index | ||
| 942 | _cS | ||