00298nam a2200133Ia 4500003000400000005001700004008004100021020001800062082000800080100002200088245002600110260001900136260000900155OSt20260310181635.0260210s9999    xx            000 0 und d  a9780486404738  a742  aErnest R. Norling 0aPerspective Made Easy  bDOVER PUB 1999  c1999