TY - BOOK ID - 149849413 TI - Concentration : A Guide to Mental Mastery. PY - 2023 SN - 9781801520744 PB - London : Aeon Books Ltd., DB - UniCat KW - Mental discipline KW - Centering (Psychology) UR - https://www.unicat.be/uniCat?func=search&query=sysid:149849413 AB - An accessible guide to controlling the mind. ER -