How one heading string is checked. Click a box to see the sheets behind it; the band at the bottom is the 182 special-topic sheets, reached by the subdivision or heading type that triggers them.
314 sheets, 1,632 citations between them. Size is page count, colour is the kind of sheet. Hover to read, click to open; the neighbours stay lit.
41 subdivision lists, 5,717 entries
Bars are entry counts, split by subfield: $x topical $v form $y chronological $z geographic. Click a list.
One subdivision, every list that carries it
Most shared wordings
972 of 3,507 subdivision strings sit on more than one list, each with its own usage statement.
3,628 distilled rules by sheet. Area is the number of rules; darker cells have more prohibitions. Click a kind to zoom in, a sheet to read its rules.