The excerpt provides up-to-date information about the illness that struck Helen.

BOTH

The Life of Helen Keller
Biography

The Story of My Life
Autobiography

an informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.