As of today's date, here's a list of the mythologies I currently plan to cover in the book. An asterisk indicates a subject that may not have enough material to justify an entire chapter, in which case I'll fold it into another appropriate chapter or put it in the Miscellaneous section. A check-mark indicates a chapter that's finished in first draft form.
African (covering all tribes and parts of the continent not covered in other chapters)
✔Ainu
✔American Indian (split into six sub-chapters covering major cultural groups; may be further expanded as work on the book progresses)
✔Armenian
✔Assyro-Babylonian
✔Australian Aborigine
✔Aztec
✔Baltic
Canaanite/Ugaritic
Celtic, Irish
Celtic, Welsh
Celtic, Gaulish/Brythonic
Celtic, Celtoiberian
✔Chinese
✔Egyptian
Estonian*
✔Etruscan
Filipino*
✔Finnish
Georgian
Germanic*
✔Greek and Roman
✔Hawaiian
✔Hindu
Hittite
Hungarian*
Incan
✔Japanese
Malay*
Maori
Masai*
✔Mayan
Mongolian/Turkic*
✔Norse
Oceanic (covering all peoples and parts of the region not covered in other chapters)
Persian
Scythian*
✔Slavic
South American*
✔Sumerian
Uralic/Ugric/Siberian
Voodoo
✔Yoruban
Miscellaneous
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The current record-holder for length is Hindu Mythology, at 70,000 words. Since I've split Celtic up into four separate chapters, I don't expect any other chapter to beat that total. Some of the runners-up include: Greek and Roman, 42,000 words; Chinese, 37,000 words; Norse, 36,000 words; American Indian, 32,000 words. The shortest so far is Armenian, at just 3,500 words. Most of the others fall into the 15,000-25,000 range, but some are shorter than 10,000.
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As of March 2017, I am currently working on the Canaanite Mythology chapter, having just finished Hawaiian.