K. B. Beaton, "A Practical Dictionary of German Usage"

There's nothing like a book which gives wonderful descriptions of synonyms for the language one is trying to master. If you're looking for a text that goes into detail showing which word is appropriate when, then this book is for you. It is arranged in dictionary form–with the common or most basic English words as headings, followed by separate paragraphs explaining which German word(s) to use to render the meaning of the general English word AND–most importantly–synonyms of that general word.