Sources for Aage Christian THOMSEN:

1. ,
2. Cushing, Thomas Cushing, History of Allegheny county, Pennsylvania : including its early settlement and progress to the present time ; a description of its historic and interesting localities ; its cities, towns and villages; religious, educational, social and military history ; mining, manufacturing and commercial interests, improvements, resources, statistics, etc. ; also, biographies of many of its representative citizens. (1889), (http://digital.library.pitt.edu/cgi-bin/t/text/text-idx?idno=00afq9167m;view=toc;c=pitttext).