It is from "Tunnel-Digging as a Hobby (Aug, 1932)" By Modern Mechanics. The other pages are about various strange homes (one is a hanging home, etc ...)
According to Pamela M. Henson, they got Dyar in a bit of trouble: During the 1920s Dyar's most peculiar hobby came to light. When a truck fell into a labyrinth of tunnels near Dyar's old home in 1924, newspaper speculation attributed these to World War I spy nests, Civil War trysts, and mad scientists. Eventually Dyar accepted responsibility for the tunnels and similar works behind his new home, saying he found relaxation in digging underground. The brick-walled tunnels extended for hundreds of feet and measured six by six feet.
More photos (just three) here http://thelocation.wordpress.com/201...rue-d-c-story/