6.1 article
 6.2 report
 6.3 book
 6.4 letter
 6.5 AMS Art, Proc, Book
  6.5.1 amsart
  6.5.2 amsproc
  6.5.3 amsdtx
  6.5.4 amsbook
  6.5.5 Divisions
  6.5.6 Tocs at Cut Points
 6.6 amsppt.sty
 6.7 amstex.tex
 6.8 amsthm.sty
 6.9 amsmath
 6.10 amstex.sty (amstex1)
 6.11 amscd
 6.12 Memoir
 6.13 Elsvier Articles (elsart)
 6.14 American Psychological Association (APA)
 6.15 JHEP
 6.16 acm-proc-article-sp
 6.17 scrbook
 6.18 scrreprt
 6.19 Europe CV
  6.19.1 General
  6.19.2 Language
 6.20 Res
 6.21 aa
  6.21.1 Sizes of Fonts
  6.21.2 ltxguide
 6.22 Polish: mwart.cls, mwrep.cls, mwbk.cls
 6.23 texinfo