Phillips, Morgan W. (1974). "SPNEA-APT Conference on Mortar, Boston, March 15-16, 1973". Bulletin of the Association for Preservation Technology. 6 (1): 9–39. doi:10.2307/1493409. JSTOR1493409.
Phillips, Morgan W. (1974). "SPNEA-APT Conference on Mortar, Boston, March 15-16, 1973". Bulletin of the Association for Preservation Technology. 6 (1): 9–39. doi:10.2307/1493409. JSTOR1493409.