1 Mason & Co. 1 Mason & Hamlin Co. 1 Mason, Josiah, 1795-1881 17 Masonic buildings 6 Masonic Hall 1 Masonic Home of Pennsylvania 35 Masonic Temple 4 Masonry 1 Mason's Blacking Factory 1 Masquerades 66 Mass transit 51 Massachusetts 14 Massachusetts State Building 9 Massacre of the Holy Innocents 1 Massacres 2 Masses (eucharists) 1 Massett, Stephen C. 8 Master Humphrey's Clock 11 Master Street 1 Master Street 1 Masters 1 Mastodons 2 Masts 3 Matches 5 Maternity hospitals 1 Mathematical instruments 1 Mathematics 1 Mathew, Theobold 1790-1856 1 Mathew's Paper Mill 2 Mathews, Charles James, 1803-1878 1 Matias Lopez (Firm) 1 Matlack & Son Carbon Works 1 Matlock Bath, England 2 Matricolas 1 Matson's Mill 1 Matsumae, Japan 4 Matsuo-Ehe (Firm) 1 Matte's Slaughterhouse 1 Matthew & Moore Machine Works 14 Matthew, the Apostle, Saint
