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American Architects Directories:
Listing in 1962 American Architects Directory
Listing in 1970 American Architects Directory
Related Records
Charles V. Northrup
Leonard Adrian Waasdorp
William G. Kaelber
Waasdorp & Northrup (firm) https://portal.aia.org/sites/hdoaa/Temp/Firms%20A-Z/eac4005589.doc
Northrup, Kaelber & Kopf (firm)