Depths shown by isolines and gradient tints. "Map projection: Latitude/Longitude (WGS84)." Shows gas fields, oil fields, gas pipelines, oil pipelines, refineries, concession blocks. Includes abbreviation list,statistical tables, and graphs. Includes notes, graphs, and small-scale inset of eastern former Soviet Central-Asian republics. "Copyright: The map is the exclusive copyright of the publishers and may not be reproduced in whole or part whithout the written authority of the publishers." "Map data corrected as of April 2013" Includes advertisements. Map sponsors: Clarksons Platou offshore and Dunlop oil & marine.