My daughter, Nicole VanderMeer, is an interdisciplinary historian, and she offers research support to writers of fiction and nonfiction. She launched her new website today, and I want to help spread the word. Here's a link to the site.
Nicole has already helped authors I admire.
I hired her as well, for my WIP, and she's amazing. (Since I'm her mother, I realize the other references may carry more weight! :))
Contact Nicole if you would like her to help research your book!