https://www.nytimes.com/2013/09/13/movies/herb-dorothy-50x50... | https://archive.today/ZtkkQ
https://en.wikipedia.org/wiki/Herbert_and_Dorothy_Vogel
https://en.wikipedia.org/wiki/Herb_and_Dorothy
https://archive.org/details/ExhibitionNotes41Summer2012
https://archive.org/details/dorothyherbertvo00ball
https://archive.org/details/witnde-Cafe_-_Fifty_Works_for_th...
https://archive.org/details/fromminimaltocon0000unse
https://archive.org/details/Charlie-Rose-1992-01-31 (starts at 39:20)