00345nam a2200097Ia 4500008004100000020000600041100003000047245004600077999001900123952010500142211105s9999    xx            000 0 und d  a"  a LEEDY, Paul D.  9116621 0aPractical research : planning and design   c577255d577254  00104070aERMELLbERMELLd2021-11-08g460.00l0o001.4 LEEDp3300310016784r2021-11-08w2021-11-08