TY  - BOOK
T1  - A laboratory and field manual of ornithology;
DA  - 1956
CY  - Minneapolis,
AU  - Pettingill, Olin Sewall,
ET  - 3rd ed.
CN  - QL677.5
CN  - QL677.5
PB  - Burgess Pub. Co.,
PP  - Minneapolis,
PY  - 1956
ID  - 63571
KW  - Ornithology.
TI  - A laboratory and field manual of ornithology;
ER  -