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We have surveyed 44 YSOs located near the edges of MIR-identified bubbles in CS(1-0) using the GBT. Our conclusions are:  \begin{itemize}  \item We have detected CS toward 18 sources sources.  \item Using Herschel/HiGal survey data, we calculated CS abundances for these sources to be $\sim$10$^{-7}$ and range between 0.16-9.36 $\times$10$^{-7}$ $\times$10$^{-7}$.  \item Three sources show non-gaussian line-profiles with strong emission on the blue-shifted side. We interpret this profile as caused by gas infall onto a protostar.  \item Two of the infall candidates (N62-1 and N90-2) are embedded in infrared dark clouds along the edge of their expanding bubbles. The combination of photometry-based YSO identification, CS-based infall, location inside an IRDC and on the edge of an expanding bubble is strongly suggestive of triggered star-formation.  \item Using a two-component model, we estimate that one infall candidate, N117-3, has an average infall speed of 0.31 km/s and a mass infall rate of 2.9 $\times$ 10$^{-5}$ M$_\odot$/yr. These numerical results are consistent with intermediate to massive star-formation.