TY  - GEN
AU  - Hörstadius,Sven
TI  - Introduction to swedish ornithology
PY  - 1951///
CY  - Uppsala : 
PB  - Almqvist & Wiksell, 
N1  - it's part of: Proceedings of the 10. International ornithological congress : Uppsala,_June 1950 / edited by Sven Hörstadius
ER  -