lrt20_psalterium_ordinarium.tex

% !TEX TS-program = lualatex
% !TEX encoding = UTF-8

\documentclass[liber-responsorialis_temporale.tex]{subfiles}

\ifcsname preamble@file\endcsname
  \setcounter{page}{\getpagerefnumber{M-lrt20_psalterium_ordinarium}}
\fi

\begin{document}
\input{lr20_psalterium_ordinarium}
\end{document}