electronics_labs.tex

\documentclass{book}

\usepackage[subpreambles=true]{standalone}
\usepackage{import}

\import{preamble/}{lab_preamble}

\title{Electronics: Lab Manuals}
\subimport{./}{authors.tex}

\begin{document}
\maketitle

\import{./}{calendar}

\tableofcontents

\foreach \n in {01,02,03,04,05,06,07,08,09,10,11,12}{%
 \chapter{Lab \n}
 \import{lab\n/}{lab\n}
 \import{lab\n/}{notes\n}
}

\end{document}