Stamps of Great Britain, Bicentenary of Ordnance Survey issue
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postage
1991, Sep 17 Bicentenary of Ordnance Survey issue unwmk p. 14.25
| X | 24p | multi | Map of 1816 | |||
| X | 28p | multi | Map of 1906 | |||
| - | 33p | multi | Map of 1959 | |||
| X | 39p | multi | Map of 1991 |
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