The seventh classification, issued in signatures, was incomplete at the time of the author's death, some parts devoted to natural history were issued ...
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pt. 1. The first six classifications. 1 v[pt. 2. The seventh classification (adapted to libraries of over 150,000 volumes)（提供元: 国立国会図書館蔵書）
The seventh classification, issued in signatures, was incomplete at the time of the author's death, some parts devoted to natural history were issued after his death, the technology part was never finished. Cf. W.P. Cutter, Charles Ammi Cutter, 1931, p. 44.