Compare the price of these 2 volumes to what else is on offer on this subject and you're getting a real bargain. The books themselves are plainly written and well structured although some of the diagrams aren't as legible as one would like. Excellent reference material if you work in the Electrical sector and are new to the Oil and Gas industry. The books detail everything you would typically find offshore. Topics covered include Power Generation, Switchgear, Protection Devices, UPS equipment and Earthing. I would certainly recommend to practising and wannabe Electrical Engineers and Techs.