COMMENT ⊗   VALID 00002 PAGES
C REC  PAGE   DESCRIPTION
C00001 00001
C00002 00002	\input mripkg
C00011 ENDMK
C⊗;
\input mripkg

\setcount0 -7			%starting page numbers for key section
%				= last page of author section (or page+1);
%				negative value gives roman page numerals

\setcount9 460			%"equalized" column length of last page of
%				author section = amount by which beginning of
%				key section is to be dropped

\setcount2 635			%length of single column on full page
\setcount3 75			%length of header info
\setcount1 \count2
\advcount1 by -\count3		%reduce length of first page by header length
\advcount1 by -\count9		%reduce length of first page data by height of
%				data column on last author page
\setcount4 20			%height (total) of running heads line
\setcount5 \count2 \advcount5 by \count4	%total page height
\setcount6 154			%column measure
\xdef\colwd{\count6pt}		%column measure
\setcount7 8			%intercolumn spacing
% column measure plus intercolumn spacing should be a multiple of leader size
\setcount8 \count6 \advcount8 by \count7 \advcount8 by \count6
\xdef\colcolwd{\count8pt}	%size of two columns
\advcount8 by \count7 \advcount8 by \count6
\xdef\pagewd{\count8pt}		%full page width; sum of column widths plus space
%				initialize single-column dimensions
\hsize \colwd \vsize \count1 pt \maxdepth 2pt \topbaseline 0pt
\sixpt \baselineskip 7.5pt \lineskip 0pt
\def\sevenstrut{\lower 2.25pt\vbox to 7.5pt{}} % to fit adjacent boxes
\def\parlead{\vskip 0pt plus .1pt}
\def\negparlead{\hbox{\sevenstrut}\vskip -7.5pt plus -.1pt}
\gdef\fpage{T}			%fpage = T indicates first page
\gdef\colonflag{T}		%colonflag = T indicates that last entry set
%				was not a key descriptor
\gdef\newcolumn{F}		%newcolumn = T indicates that "cont'd" will be
%				needed in current column
\gdef\lr{L}			%lr = L means the next output will be left 2/3

%	note - references (mr numbers, cmp, or author cross-references) must
%		be enclosed within the same {...} group as the key text (\key
%		or \colonsub) to which they refer
\def\flushcontd{\if T\newcolumn{\topinsert{\box0}\gdef\newcolumn{F}}\else{}}

\def\key#1{			%regular key text
	\flushcontd
	\if T\colonflag{\mark{F{}}\gdef\colonflag{F}}\else{}
	\penalty -100		%break is permissible before any regular key
	\parlead
	\hbox par \colwd{\sevenstrut\hangindent 1.5em#1\sevenstrut\npg}}

\def\colonkey#1{		%text of key preceding colon (descriptor)
	\flushcontd
	\if T\colonflag{\mark{F{}}}\else{\gdef\colonflag{F}}
	\penalty -200		%break is very permissible before any colon key
	\parlead
	\gdef\colonflag{T}	%last key set IS a colon key
	\mark{T{\save0\hbox par \colwd{\sevenstrut#1
	({\sl cont'd.})\sevenstrut}}}
	\hbox par \colwd{\sevenstrut\hangindent 1.5em#1\sevenstrut}
	\gdef\firstsub{T}
	\penalty 1000}	%do NOT break between descriptor and subdescriptor

\def\colonsub#1{		%text of key following colon (subdescriptor)
	\flushcontd
	\parlead
	\hbox par \colwd {\sevenstrut\!
		\hangindent 3em\hskip 1.5em#1\sevenstrut\npg}
	\if T\firstsub{\gdef\firstsub{F}\penalty999}\else{}}
%			discourage break at bottom of page if
%			fewer than 2 entries have followed new colon key


\output{\outa}
% the following tricky code looks at \botmark, which is either "F{}"
%	or "T{\save0\hbox par \colwd{...}}"
\def\markit{\trace'357\xdef\contdkey{\botmark}
\gdef\newcolumn{T}\if T\contdkey\else{\gdef\newcolumn{F}}}
\def\outa{\output{\outb}\markit\par\save1\page}
\def\outb{\output{\outc}
\markit\par	%now we print the left 2/3 page
\vbox to \count5 pt{\baselineskip0pt\lineskip0pt
%				this full-page length includes running head
	    \vbox to \count4 pt {\vfill	%begin running head
		\eightpt\bf\hbox{\!
		\spose{\hbox to \pagewd{\hfill KEY INDEX\hfill}}
		    \ifeven0{}\else{\count0}}% left edge of running head
		\vskip 12pt}
	    \if T\fpage{\vbox to \count9 pt{\sixpt
			\hbox to \colcolwd{top line of authors\hfill
				top line of authors}
			\vfill\hbox to \pagewd {\:q\hfill
				(strip author section here)\hfill}
			\vfill\hbox to \colcolwd {bottom line of authors\!
				\hfill bottom line of authors}}
		    \vbox to \count3 pt{\vfill
			\hbox to \pagewd {\:>\hfill KEY INDEX\hfill}
			\vskip 35pt}}
	    \else{}
	    \hbox to \colcolwd {\box1\hfill\page}}
	\gdef\lr{R}}
\def\outc{\output{\outa}\markit\par	%now we print the right 1/3 page
\moveright \colwd\vbox to \count5 pt{\baselineskip0pt\lineskip0pt
	    \vbox to \count4 pt {\vfill	%begin running head
		\eightpt\bf\hbox to \colwd{\hss
		\hbox to \pagewd{\spose{\hbox to \pagewd{\hfill
			KEY INDEX\hfill}}\hfill
		    \ifeven0{\count0}\else{}}}	% right edge of running head
		\vskip 12pt}
	    \if T\fpage{\vbox to \count9 pt{\sixpt
			\hbox to \colwd{\hfill top line of authors}
			\vfill\hbox to \colwd {\hfill bottom line of authors}}
		    \vbox to \count3 pt{\vfill
			\hbox to \colwd{\hss
			\hbox to \pagewd {\:>\hfill KEY INDEX\hfill}}
			\vskip 35pt}
		\vsize \count2 pt \gdef\fpage{F}}
	    \else{}
	    \page
	    \advcount0}		%increment page number
	\gdef\lr{L}}
\def\closeout{\vfill\penalty-1000
	\def\n{\hbox to \colwd{}}
	\if\lr L{\n\eject\if\lr L{\n\eject}\else{}}\else{}
	\n\end} % gets the last page out
\negparlead % this is necessary to cancel \parlead at beginning of first column
	% (since the first thing on that page is a \mark)