'Physical [processes]', file of M S Bartlett File contains notes and calculations about 'the paradox of probability in physics', 'three-dimensional random walk with constant velocity', 'one-sided two-dimensional models', 'notes on probability in quantum [mechanics]'. File also contains correspondence between Bartlett to Dr H A C Dobbs in which Dobbs gives feedback on a recent talk of Bartlett's. Bartlett addresses the issues raised in his reply. n.d.