1 Introduction
2 Data set
2.1 12 CO ${\mathit{J}}{=}\ 1{-}0$ observations with the NANTEN2 telescope
2.2 FUGIN $^{12}$ CO, $^{13}$ CO, and $\mathrm{C}^{18}$ O ${\mathit{J}}{=}\ 1{-}0$ data
3 Results
4 Discussion
4.1 Star formation in the Spitzer bubble N19
4.3 Possibility of the formation of the NGC6611 cluster by a cloud collision
5 Conclusions