The book indeed says:
On the other hand, the book is free anyway and, OK, I will study it and see what else is new in it.Each summer in 1976 and 1977, I set up more than two hundred green nest boxes in groups of two or three across Tompkins County and each summer over half of my nest-box groups attracted at least one wild swarm
To build the many nest boxes needed for this study, I spent most of my Christmas break in 1975 sawing and hammering and painting in the wood shop at Dyce Lab. There I constructed 252 nest boxes and used up enough plywood(more than 70 sheets) for building a small house. With these hundreds of nest boxes, I would eventually capture 124 swarms in 1976 and 1977.
Something is not adding up around the dates but I will check that later.
No need to point out my "cheap" ways either.
Yes, I am a "cheapo" and am fine with it.
Download the original book here (FREE):