By A Mystery Man Writer
Frontiers A Case Study of Deep Shaft and Open Face Tunnelling Induced Excessive Ground Settlement in Water Rich Strata in Guangzhou, China
豎井下沉Shaft Sinking: 最新的百科全書、新聞、評論和研究
Making the Right Shaft Connections
Tunnel - Wikipedia
Actual vertical shaft constructions.
Atsushi Yashima's research works
Small-diameter vertical shafts constructed in the shallow space of steep mountainous areas - ScienceDirect
Sinking unit in St. Petersburg.
Illustration of a shaft construction project in St. Petersburg
Shaft sinking - Wikipedia
Shaft Sinking