This is a useful reference work, and also of historical interest. It should be noted, however, that it is not always accurate.
It’s a reprint of the 1946 edition of Jane’s Fighting Ships, with entries taken from the 1939 edition for those ships that were sunk during the war. Consequently, it has the best information available in 1939/1946, but that isn’t necessarily entirely accurate or as good as what is available now. It is affordable and very comprehensive, well worth adding to your collection as long as you are aware of its limitations.