This volume is reproduced by kind permission of Neil Donaldson and HH Sales Ltd.. It is the central text for Arabian Gulf (Persian Gulf) States postal history and it provides the 'numbering system' used by those involved in this collecting area. If you are interested in Muscat, Oman, Guadur, Bahrain, Dubai, Kuwait, Qatar, Abu Dhabi or, more generally, the BPAEA then this volume is valuable reading.The book is, essentially, a reprint of the first edition which was published in 1975. Due to the quality and method of printing the original edition (and limitations imposed by how this version was created) some images lack detail.Time has added further information; the 'Supplement' can be acquired elsewhere.This book is the key text for those wishing to understand the postal history of this area, but it is more than a dry postal history reference book--it is also a great read!