The 1e DMG had setting rules as well, as did sources like the Dungeoneer's and Wilderness Survival Guides. Lots of tables, mostly, but I'm a big fan of tables.
All ur tablez r belong to Gygax.
The High Gygaxian Table of Tables
Roll to see how many tables you need for your book.
00 – 10 The number of tables you wanted, doubled.
11 – 25 Hyperlinks to even moar tablez.
26 – 35 More tables than Ikea has meatballs, or tables.
36 – 50 A table for every awesome name in Greyhawk. Melf went to Verbobonc. Heh.
51 – 65 Sixteen appendices, full of tables.
66 – 75 Every table has four legs, and each leg is a table. Tables, all the way down.
76 – 85 You know the story by Borges? Library of Babel? Yeah, like that. But tables instead of books.
86 – 90 One table, that is a meta-table, that contains all the tables, including the meta-table. Godel to the yodel, yo.
91 – 92 Only one table, but that table is actually another copy of the book in its entirety.
93 – 94 Three tables- snow, frost, and ice.
95 – 98 No tables, because they were destroyed by the Scarlet Brotherhood.
99 – 00 Roll twice, add the results.