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Filing Detail
Form SC 13G/A - Statement of acquisition of beneficial ownership by individuals: [Amend]
SEC Accession No. 0001167674-13-000216
Filing Date
2013-02-11
Accepted
2013-02-11 16:57:56
Documents
1

Document Format Files

Seq Description Document Type Size
1 SCHEDULE 13G/A rrd216.htm SC 13G/A 51009
  Complete submission text file 0001167674-13-000216.txt   52699
Mailing Address 508 WEST WALL SUITE 800 MIDLAND TX 79701
Business Address 508 WEST WALL SUITE 800 MIDLAND TX 79701 9156843000
DAWSON GEOPHYSICAL CO (Subject) CIK: 0000351231 (see all company filings)

IRS No.: 750970548 | State of Incorp.: TX | Fiscal Year End: 0930
Type: SC 13G/A | Act: 34 | File No.: 005-39364 | Film No.: 13592676
SIC: 1382 Oil & Gas Field Exploration Services

Mailing Address 6300 BEE CAVE ROAD BUILDING ONE AUSTIN TX 78746
Business Address 6300 BEE CAVE ROAD BUILDING ONE AUSTIN TX 78746 (512) 306-7400
DIMENSIONAL FUND ADVISORS LP (Filed by) CIK: 0000354204 (see all company filings)

IRS No.: 222370029 | State of Incorp.: DE | Fiscal Year End: 1231
Type: SC 13G/A
SIC: 0000