TY  - RPRT
TI  - Acid precipitation and food quality: Effects of dietary Al, Ca and P on bone and liver characteristics in American black ducks and mallards
AU  - Donald W. Sparling
PY  - 1991
DO  - 10.1007/bf01055347
UR  - https://pubs.usgs.gov/publication/5221100
ID  - 5221100
ER  -