TY - BOOK ID - 131276755 TI - Paraat rekenen in boekvorm AU - Calsius, H. AU - Vandersteegen, Lode PY - 1959 PB - Place of publication unknown publisher unknown DB - UniCat KW - Didactics of mathematics KW - Didactics of primary education UR - https://www.unicat.be/uniCat?func=search&query=sysid:131276755 AB - ER -