00668nam 2200265zu 450 991091726810332120241203191008.097818006409791800640978(CKB)36718592100041(EXLCZ)993671859210004120241203|2020uuuu || |engur|||||||||||Making up NumbersOpen Book Publishers20209781800640955 1800640951 9781800640962 180064096X Kopp Ekkehard56444BOOK9910917268103321Making up Numbers2222406UNINA