My son gave me Art of Field Recording, Volume 1, a four-CD set with a very nice accompanying book. There is also a Volume 2. Cost for each is about fifty bucks, but worth it. They are "temporarily out of stock" at Amazon, which often means that they will never be stocked again. The box sets are billed as "Fifty years of traditional American music documented by Art Rosenbaum."
Rosenbaum has a video introduction to Volume 2 here (click)

-Joe-