TY - RPRT TI - Effects of malathion, diazinon, and parathion on mallard embryo development and cholinesterase activity AU - David J. Hoffman AU - W. C. Eastin PY - 1981 DO - 10.1016/0013-9351(81)90222-x UR - https://pubs.usgs.gov/publication/5221678 ID - 5221678 ER -