cam a22 2 4500 282768548 CHVBK 20201020195508.0 130818s1963 xxk 0 eng d SPI Retro 532959 (NEBIS)002111175 (RERO)R251143860 SzZuIDS NEBIS ETH-BIB s1pe rero An experiment in education by Sybil Marshall Cambridge University Press 1963 222 + 36 S. Marshall Sybil BK020000 XK020000 XK020000 SPIdummy nebis ER RERO RE61096 RE61096 RE610960003 FPEA 9991 370.36 MAR NEBIS E16 E16 RH A 12092 NEBIS 700 1- Marshall Sybil RERO 100 1- Marshall Sybil (IDREF)052489426 cre