Werner, Dietrich; Burmeister, Kurtis (2007). "An Overview of the History and Economic Geology of the Natural Cement Industry at Rosendale, Ulster County, New York". Journal of ASTM International. 4 (6): 100672. doi:10.1520/JAI100672 – via ASTM Compass.
Werner, Dietrich; Burmeister, Kurtis (2007). "An Overview of the History and Economic Geology of the Natural Cement Industry at Rosendale, Ulster County, New York". Journal of ASTM International. 4 (6): 9, 10. doi:10.1520/JAI100672 – via ASTM Compass.