This book exists at LSU, Tulane, and the Louisiana State Library. I must acquire and read it as it apparently describes the experience of this Louisiana historian and his Creole concubine. I found out about it on the plaçage wiki which, interestingly, locates plaçage in Saint-Domingue and in various other places, but not in Havana. And now, as we know, it is also said that plaçage is a myth.
It is said that bailes de cuna in Havana and New Orleans quadroon balls were similar events with similar purposes, and it is worth noting that New Orleans and Havana are sister cities, facing each other across the Gulf; there were many ships traveling back and forth every day. Cecilia Valdés, published in New York after Villaverde had been in the United States thirty years, could be claimed as an American as well as a Cuban novel.