"Krumbein, Fritz". Germans to America Passenger Data File, 1850 - 1897. National Archives. Archived from the original on January 30, 2015. Retrieved January 30, 2015.
Authorities have offered 1870 as another year for construction of the building, but in that case Williams and Krumbein were not yet associated, see Mickle, Judith; et al. (2008). "Skidmore/Old Town Historic District"(PDF). NRHP Continuation Sheet (Revised). National Park Service. Archived from the original(pdf) on January 30, 2015. Retrieved January 30, 2015.
Quoted in the Chinatown/Japantown Historic District continuation sheet, see Rees, Judith; et al. (1989). "Portland New Chinatown/Japantown Historic District"(PDF). NRHP Continuation Sheet. National Park Service. Section 7, p. 30. Archived from the original(pdf) on January 30, 2015. Retrieved January 30, 2015.
Michelson, Alan. "Krumbein, Justus". Pacific Coast Architecture Database. University of Washington. Archived from the original on January 30, 2015. Retrieved January 30, 2015.
web.archive.org
"Krumbein, Fritz". Germans to America Passenger Data File, 1850 - 1897. National Archives. Archived from the original on January 30, 2015. Retrieved January 30, 2015.
Michelson, Alan. "Krumbein, Justus". Pacific Coast Architecture Database. University of Washington. Archived from the original on January 30, 2015. Retrieved January 30, 2015.
Authorities have offered 1870 as another year for construction of the building, but in that case Williams and Krumbein were not yet associated, see Mickle, Judith; et al. (2008). "Skidmore/Old Town Historic District"(PDF). NRHP Continuation Sheet (Revised). National Park Service. Archived from the original(pdf) on January 30, 2015. Retrieved January 30, 2015.
Quoted in the Chinatown/Japantown Historic District continuation sheet, see Rees, Judith; et al. (1989). "Portland New Chinatown/Japantown Historic District"(PDF). NRHP Continuation Sheet. National Park Service. Section 7, p. 30. Archived from the original(pdf) on January 30, 2015. Retrieved January 30, 2015.