TY  - BOOK
AU  - Rollins, Dale R...(et al)
TI  - Measurement while drilling : no. (40)
SN  - 1555630618
AV  - TN 871.35 .M43/ 
CY  - Taxas
KW  -   Oil well logging, Electric.  Oil well drilling.  Orientation--Measurement.
ER  -