ISBN 1957569409 books & textbook
Anthroposophy and Science: Observation, Experiment, Mathematics (CW 324) (Mercury Press)
Steiner, Rudolf Karnow, Gerald F. Hahn, Gladys Gardner, Mark Stuber, Walter Unger PhD, Georg
Mercury Press /1994-12-06 Paperback / 156 Pages
isbn-10: 1957569409 / isbn-13: 9781957569406
