found: New York (N.Y.). Landmarks Preservation Commission. Fire Engine Company No. 65, 1990:p. 1 (Hoppin & Koen) p. 4 (begun 1894 at 160 Fifth Ave., N.Y.; ended with Koen's death 1923)
found: Francis, D. S. Archs. in practice NYC, 1840-1900, 1980:p. 40 (Hoppin & Koen)
found: New York (N.Y.). Landmarks Preservation Commission. Firehouse, Engine Company 73 and Hook & Ladder Company 41, 2013, viewed January 31, 2014:PDF page 1 caption ([Francis L.V.] Hoppin & [Terence A.] Koen, architects) page 5 (Frances L.V. Hoppin & Terence A. Koen were partners who had worked in the preeminent New York City firm of McKim, Mead & White.)
