When applying for a postdoc, I submitted writing samples from my dissertation. After I was accepted, I added to the institution's library a number of texts that I cited in my research. (This was a small library in the research center that was started by the postdocs, containing no more than a few dozen books.) I developed some of the ideas from my dissertation and workshopped a paper on related matters with faculty members in the research cluster. I published that paper and acknowledged funding and input on earlier drafts. A couple years later a professor who supervised me, who never worked on related matters before, published a book in exactly my area, citing books I added to the library, utilizing original concepts and analytics from the paper I workshopped and published. The book does not acknowledge me or reference my work. I have an email trail showing the sharing of these ideas and documents. What should I do?