The potentials about a point electrode and apparent resistivity curves for a two-, three-, and four-layered earth.
Mooney, Harold Morton.
Wetzel, Wilfred Wolf.
Minneapolis, 
[1956]
Joint authors: Harold Morton Mooney and Wilfred Wolf Wetzel.
[With a bibliography.]
With master resistivity curves for a two-, three-, and four-layer earth. [A set of loose sheets in an envelope.]