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  • Post-1923 Public Domain

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Comment: Clarifying figure title

When dealing with the HathiTrust public domain volumes, the makeup of the collection changes drastically. This is because US copyright law makes it difficult to ascertain rights post-1923, resulting in representation biases. There are proportionally less public domain works approaching the present day, but the drop-off is much quicker in some categories than others. For a valid understanding of the collection, one shouldn't compare pre-1923 and 1923- subsets of the public domain collection without additional context.

 

Figure: Distribution of Categories by Proportion (in %) of collection represented by each LC Class, by Year. 1923 is marked with a vertical line.

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