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30 Rock from books.google.com
30 Bit wear .. Decreased 10 to 35 pct . 26 , 30 Drilling rate .. Increased 20 to 60 pct . 26 , 30 Rock hardness .. Decreased ..... 30 Rock strength .. Decreased 9 to 20 pct .. 30 Igneous rocks 12 .1 - Bit life ..... Increased .
30 Rock from books.google.com
260 Rock , medium . 150-200 150-200 Limonite , ore . 200 100-200 Ore , soft - medium . 15-100 Rock , medium , 50 120 Ore , medium . 60-70 150 Do. 25-30 3-4 Rock , hard , 200-300 100 Ore , soft , 45-50 15 Ore , hard .
30 Rock from books.google.com
m2 Bottom Type Depth ( cm ) L - 1 2a / 20 1,731 15 Silty - sand , gravel L - 4 2a / 17 1,285 15-30 Bedrock , cobbles L - 5A 1 11 217 15-30 Rock , cobbles , gravel C 1 10 240 15-30 Rock , cobbles , gravel L - 6 1 17 304 15-30 Rock ...
30 Rock from books.google.com
m2 Bottom Type No Depth ( cm ) L - 1 20 1,731 15 Silty - sand , gravel L - 4 17 1,285 15-30 Bedrock , cobbles L - 5A 1 11 217 15-30 Rock , cobbles , gravel C 1 10 240 15-30 Rock , cobbles , gravel L - 6 1 17 304 15-30 Rock , cobbles ...
30 Rock from books.google.com
Sand and gravel 0-30 Rock 30–10712 Farnum Pike , Woonasquatucket Res . Burlingame Rd . , 34 mile SW . of Smithfield Smi . 90 Doris J. Talbee 400 13212 6 2/3 do . do . do . 30 12/15/47 Till Rock 0–3 3-13242 Smi .
30 Rock from books.google.com
1 22 81 32 301 Precelly Top 53 I 30 49938 | Brenin Fawr 76 10 30 15469 Brenin Fawr 79 • 39 40641 Barrow near ... highest Foel Dregarn 103 9 point 33 22 30 Precelly Top 70 30 45 58302 Precelly Top 45 8 0 67142 Nipple Rock 75 5 15 56878 ...
30 Rock from books.google.com
... Change Column 5 to read Stockton Lightstation , California 121 17 30 W 37 58 30 N ( change in designation of nia ... 7a to read 2.5 Rock , California Change Column 6 to read ALA 2 ; Column 7a to read 3.0 ; Column 10 to read 30 Rock ...
30 Rock from books.google.com
30 1 30 30 1 406 30 639 427 328 30 30 655 586 311 30 574 381 398 395 319 413 30 30 30 30 30 30 621 634 631 580 646 605 566 357 5 301 302 30 30 30 30 30 30 Rock - drill .. C. S. Westbrook . 312,538 | Feb. 17 | 1488 Rock - drill .
30 Rock from books.google.com
... highest Foel Dregarn 103 9 point 33 22 30 Precelly Top 70 30 45 58302 Precelly Top o 67142 Nipple Rock 75 5 151 56878 Brenin Fawr 101 23 048542 Rock near ' Trecoon Farm 34 24 Ferwig Steeple 33 29 Brenin Fawr 10 54 056352 Precelly ...