Turning PG texts into booklets:

1. http://www.sandroid.org/GutenMark/download.html
2. GutenMark --profile=english --latex file.txt --no-parskip file.tex
3. Manual faffing: insert

\documentclass[a5paper,10pt]{book}

    \oddsidemargin  -6 mm     %   Left margin on odd-numbered pages.
    \evensidemargin -6 mm     %   Left margin on even-numbered pages.
    \marginparwidth 0 in        %   Width of marginal notes.
    \oddsidemargin -6 mm      %   Note that \oddsidemargin = \evensidemargin
    \evensidemargin -6 mm
    \marginparwidth 5 mm
    \topmargin -5 mm
    \textwidth 110 mm % Width of text line.
    \textheight 160 mm


\begin{document}

4. latex 1.tex 2.dvi
5. dvips -T 148mm,210mm -o 3.ps 2.dvi
6. psbook 3.ps 4.ps
7. psnup -Pa5 -pa4 -2 4.ps 5.ps
8. Print double-sided, flipped at SHORT edge.