TY  - JOUR
TI  - Artificial nest structures and grassland raptors
T2  - Raptor research
VL  - 14
IS  - 2
UR  - https://www.biodiversitylibrary.org/part/228400
PB  - Raptor Research Foundation
CY  - Vermillion, S.D
PY  - 1980
SP  - 41
EP  - 45
AU  - Howard, R P 
AU  - Hilliard, M
ER  -