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| Title | Registered Letter Window Book Page 3 forms: Registered Letter window receipt, Return Registered Letter Receipt, and Receipt for a Registered Letter (customer) |
| FormNumber | None |
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| Division | |
| WhereUsed | printed forms (without form #'s) provided postmasters as unbound sheets |
| EKU | 1855 DLS |
| LKU | 1873 DLS |
| Notes | |
| Source | SS |
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