TY  - BOOK
AU  - Herbert,Percy
TI  - Herbert air navigation course,
AV  - TL586 .H4
PY  - 1928///-
CY  - [Portland, Or.]
KW  - Aeronautics
KW  - Navigation (Aeronautics)
N1  - Autographed from type-written copy on one side of leaf only
ER  -