📕 Source : UNICEF© 06-Percussion - Manual drilling series. // 2010 // 64 pages.

    **[<https://www.ri.org//content/uploads/2019/08/manual-drilling-series-percussion.pdf>](<https://www.ri.org//content/uploads/2019/08/manual-drilling-series-percussion.pdf>)**

   **[<https://app.box.com/s/gkgzalukp4mlyfbt7ty4op46z5mu3jvm>](<https://app.box.com/s/gkgzalukp4mlyfbt7ty4op46z5mu3jvm>)**

https://app.box.com/s/gkgzalukp4mlyfbt7ty4op46z5mu3jvm

Source : UNICEF© // Release year — 2010.