00729cam a22002531  4500001001300000003000400013005001700017008004100034010001700075035002000092040002000112042001200132050001500144100002700159245005700186250001400243260002800257300003600285500006400321650001700385650002900402740002700431999001700458ca 29000207 DLC20260227111121.0840625m19281999orua          000 0 eng    aca 29000207   a(OCoLC)10880188  aDLCcFDbERdDLC  apremarc00aTL586b.H41 aHerbert, Percy,d1869-10aHerbert air navigation course,cby Capt. P. Herbert.  aLesson 1-  a[Portland, Or.]cc1928-  av.billus., diagrs.c35 1/2 cm.  aAutographed from type-written copy on one side of leaf only 0aAeronautics. 0aNavigation (Aeronautics)0 aAir navigation course.  c16493d16493