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Hi,

Occasionally, I find that different publications reference the same bibliographic source with different dates. For example Acta Societatis scientiarum fennicae, 19 published in 1893. Can be seen online here: http://www.biodiv...item/52290
Some catalogs reference chapter 19(3) to 1891 or chapter 19(15) to 1892 and other reference all chapters to 1893.
When I'm looking at the first cover page I see it was publish at MSCCCXCIII and no other data is available.
How can I know what is the true publish time for each chapter? Could they published separately or earlier dates than 1893 is just an error?