What is a newspaper typeface?

Hi there,

I am interested in reading / researching about what is currently understood as a 'newspaper typeface'. In your opinion, what are the (technical and aesthetic) features that make a typeface optimal for newspapers? Can you recommend good books or articles on this subject?
Also, what are the fonts that you think constitute the archetype of a 'newspaper typeface'.
Thanks in advance.

PS, I've found this book to be useful: Historia del periódico y su evolución gráfica, by André Gürtler.