THIS LAND, An American Portrait, by Jack Spencer.
After ordering this book months ago, and frankly forgot all about it, suddenly Amazon shipped it, and they even cut the price from $45 down to $23.
I was not familiar with Jack Spencer, and Googling doesn't bring up any personal information other than he was born in Mississippi in 1951 and practices his craft in Nashville, Tennessee.
His method of working is certainly not obvious to me -- he could be shooting anything from 35mm to ULF, although there are some hints from images including what appears to be the edges of Polaroid 55. Does anybody out there in LF land have any more information?