v. 1-24, 1887-97, 2 v.; v. 25-50, 1898-1905, 2 v.; v. 51-75, 1905-11, 1 v.; v. 76-100, 1911-22, 1 v.; v. 101-125, 1922-27, 1 v.
In v. 4-12 every second volume includes author and subject index to itself and preceding volume; beginning with v. 15 the indexes are in every third, fourth, fifth or sixth volume.
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