20

Development of a Novel Hybrid-Type Rotary Steerable System for Directional Drilling

Year:
2017
Language:
english
File:
PDF, 10.85 MB
english, 2017
40

New fossil plants from the Nampo Group (Lower Mesozoic), Korea

Year:
2001
Language:
english
File:
PDF, 437 KB
english, 2001