1. Aeromagnetic-anomaly map and related geophysical maps of the Delta 1⁰ x 2⁰ quadrangle, Utah Yale Public content 1991. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by Map Distribution. English. Public. Utah and Delta Region.