In Born Modern: The Life and Design of Alvin Lustig, Steven Heller notes (page 35) that “Euclid: A New Type” included two type experiments that led to the design of the masthead of Arts & Architecture.
This unfinished typeface has recently been brought back to life as HWT Lustig Elements, a collaboration between Craig Welsh and Elaine Lustig Cohen, via P22.
The smaller text appears to combine Futura by Paul Renner and Metro No. 2 by William A. Dwiggins.