Preliminary studies for the "Philosophical investigations" ; generally known as the Blue and Brown books.

Preliminary studies for the 'Philosophical investigations' : generally known as the Blue and Brown books.

by Wittgenstein, Ludwig, 1889-1951
Published 1969

Preliminary studies for the "Philosophical investigations" generally known as The blue and brown books /

by Wittgenstein, Ludwig, 1889-1951
Published 1958