1. Barr, J.F.: 1986,Can. Wildl. Serv. Occasional Pap. No. 56 23p.
2. Belant, J. & Anderson, R. K.: 1990,Passenger Pigeon 52, 307?310.
3. Blair, R.B.: 1990,Passenger Pigeon 52, 119?126.
4. Cope, W.G., Wiener, J.G., and Rada, R.G.: 1990,Environ. Toxicol. Chem. 9, 931?940.
5. Crewther, W.B., Fraser, R.D., Lennox, F.G., Lindley, H.: 1965,Adv. Prot. Chem. 20, 191?346.