\input{preface} %\standalonefalse \chapter{\formaldehyde observations of BGPS sources not previously observed with Arecibo} \label{ch:h2colarge} \section{Preface} Given our success with the simple 4-hour GBT observation of $\sim20$ sources, it was decided that a large-scale survey of BGPS sources accessible to Arecibo and the GBT would be productive. We therefore selected 400 pointings in the Arecibo-accessible declination range, 137 of which are in the outer galaxy ($172