The T.I.D. tugs of World War Two / W. J. Harvey.

"There were several British standard tug designs constructed during the war years, ranging from the large deep-sea Assurance and Bustler classes and the 164 vessels forming the thirteen classes with EMPIRE and ROCK prefixed names. The numerically largest class of 182 steam-powered vessels known as the T.I.D.s (or TIDs) was the smallest in actual vessel size. This A4 size, softback book contains the meticulously researched career histories of all 182 T.I.D.s."--Provided by the publisher.