TY  - BOOK
AU  - Duncker,Hans-Rainer
TI  - The lung air sac system of birds: a contribution to the functional anatomy of the respiratory apparatus 
SN  - 0387056599 (New York)
PY  - 1971///
CY  - Berlin [etc.]
PB  - Springer
N1  - Summary in English and German
ER  -