He worked on Ravisloe in Chicago, allegedly, in 1901. Unless it was his father or something. Or perhaps his work was later. Not sure, but Ravisloe certainly claims him.
Clovernook does seem like it came pretty early in the Langford and Moreau partnership though. It's neat to see some of their holes that almost became "templates" from out there. 6 is a smaller version of 10 at Lawsonia. 5 has some similarities with 4 at Spring Valley strategically even if the form is quite different. 14's green is a predecessor to 15 at Harrison Hills. 16 feels a bit like 9 at Lawsonia. And of course, the greens throughout the course really set the tone for what you find on their later courses, and arguably surpass their later efforts.