Shōbōgenzō raihai tokuzui - 正法眼藏禮拜得髓
I used to hear that Suzuki's thesis was on bowing. That's part of the name of Raihai Tokusui that he wrote it on. I bet he'd rather we read the Dogen than wonder what he wrote in college so I put links to a couple of translations on the cuke page for Suzuki's thesis.