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| Back Thumbnail |
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| Title | Rules for registration of letters by Letter carriers |
| FormNumber | 3899 R |
| Revision | 5-1476 |
| Division | |
| WhereUsed | |
| EKU | |
| LKU | |
| Notes | Third of three similar cards with this number. Both different front and back text on card compared to the first. |
| Source | Russ |
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