\documentclass[twoside]{minimal}
%%% TODO: Add text on spine
% A4 =   21.00    x 29.70
% Letter 21.59 cm x 27.94 cm
% spine is 1.5cm
% make just a teeensy bit bigger
% sheets are 18.5cm x 25cm
% 18.5 + 0.2 = 18.7cm  and  25.0 + 1.5cm + 0.2 = 26.7
\usepackage[paperwidth=18.7cm, paperheight=26.7cm,dvips=false,pdftex=false,vtex=false]{geometry}
\usepackage[letter, cross, axes]{crop}  % letter or a4
\usepackage[final]{pdfpages}
\begin{document}
 \includepdf[offset=0cm 7.1cm,pages={1},noautoscale,landscape]{Manual.pdf}
\end{document}