Walt Whitman and New York gay history

Just spotted this review of a fascinating new book about Walt Whitman and gay sociability in late 19th century New York.  This is very timely for us, because Oscar Wilde Tours is planning a gay history tour of New York, to start hopefully in the spring.  New York is of course one of the richest gay history sites in the world, but there isn’t much information available about the topic:  there’s no book about it, and the only walking tours cover only the Village.