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Dates will be displayed in GARD in one of the following ways:

1900
01/01/1900
Direct The date or year is known directly because it is referenced on the item itself.
[1900]
[01/01/1900]
[1850-1875]
Assumed The date or year or range is assumed with some certainty based upon fact. Where, it's not obvious how the assumption was made, an explanation should be in the notes.
c1900
c1850-1875
Circa The date or range is a best guess and could be significantly wrong. It should not be used definitively.

 

For table-specific information on dates and earliest reference date value calculation, see Date Technical Details.