A working lookup for internal De Gruyter and DataMercs use. Type a subject, or the nine-character BISAC, and read what the public mapping actually says.

BISAC 2025 → Thema 1.6 is the official Éditeur/BISG public mapping. The join is the full nine-character BISAC. The heading shown is Thema Literal 1. That part is the contract.

DDC, LCSH and GND are heuristics, not a licensed WebDewey or authority dump. Each row carries a confidence and a provenance note. Treat them as a starting point for a human, not as a classification you may file without looking. This page does not write 082 / 650 / 689.

If a row looks too tidy, it probably is. Check the source before you trust it.

Official: Éditeur BISAC 2025 → Thema 1.6 Heuristic: DDC · LCSH · GND + provenance Not yet: title-level MARC export