\documentclass[12pt]{article}
\linespread{1.6}
\usepackage{amsmath}
\usepackage{graphicx}
\usepackage{indentfirst}
\usepackage{subfiles}
\usepackage{lipsum}
\graphicspath{{images/}{../images/}}
\addtolength{\oddsidemargin}{-.5in}
\addtolength{\evensidemargin}{-.5in}
\addtolength{\textwidth}{1in}
\addtolength{\topmargin}{-.5in}
\addtolength{\textheight}{1in}
%-----------------------------------------------------------
\begin{document}
\subfile{sections/01-titlepage}
\subfile{sections/02-abstract}
\tableofcontents
\clearpage
\listoffigures
\clearpage
\listoftables
\clearpage
\pagenumbering{arabic}
\subfile{sections/03-purpose}
\subfile{sections/04-introduction}
\subfile{sections/05-experimentaldescription}
\subfile{sections/06-resultsanddiscussion}
\subfile{sections/07-erroranalysis}
\subfile{sections/08-conclusion}
\subfile{sections/09-recommendations}
\subfile{sections/10-designextension}
\subfile{sections/11-notation}
\section{Literature Cited}
\bibliographystyle{unsrt}
\bibliography{refs.bib}
\clearpage
\subfile{sections/12-appendix}
\end{document}
