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Welcome to the Masonry Institute of St. Louis website. Dedicated to the promotion of union masonry construction and masonry products in the greater St. Louis area. Please send us your comments and questions by using the Contact Us page. The 2014-2015 seminar schedule is here! Click the image below. Sign up now for any or all programs. Additionally, the MASONRY 20.3 Newsletter is available. Click the image below to read.