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For almanacs that are dated the same year for which they are issued, correct the date to the year prior, though add a question mark due to the conjectural nature.
For example:
Oxford almanack for ... 1690. London: Printed for the proprietors, 1690 [i.e. 1689?]
- 008 should be coded 's' and '1689'
- 046 should be coded "##$ax$c1690"
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