https://www.iscwsa.net/ebooks/
eBOOKs
Education Sub-Committee Joint Industry Project e-BOOK
Introduction to Wellbore Positioning - Introduction to Wellbore Positioning Web - 1 (manula.com)
Introduction to Wellbore Positioning_eBook_V9_10_2017
Well Intercept Sub-Committee e-Book V3
Well Intercept Sub-Committee eBOOK V3