The fire clays of Maryland - Watts, Arthur Simeon, 1876-; Schurecht, Harry George, 1892-; Swartz, Charles Kephart, 1861-; Hall, George Martin, 1891-; Mathews, Edward Bennett, 1869- (Baltimore, The Johns Hopkins press, 1922)
Also published in Maryland. Geological survey. [Reort] Vol. XI (1922) p. [289]-559.
Keywords: Fire-clay.; Clay -- Maryland