American Kestrel references by Donald Heintzelman
The following refrences were provided Donald Heintzelman.
References
Heintzelman, Donald S. 1962 An Unusual Sparrow Hawk Tail. Bird-Banding, 33: 204-205.
Heintzelman, Donald S. 1963 Marsh Hawk Attacks A Sparrow Hawk. Linnaean News-Letter, 17: #5.
Heintzelman, Donald S. 1964 Spring and Summer Sparrow Hawk Food Habits. Wilson Bulletin, 76: 323-330.
Heintzelman, Donald S. 1966 Observations and Comments on the Aerial Capture of Prey by the Sparrow Hawk. Linnaean News-Letter, 20: #6&7.
Heintzelman, Donald S. 1992 The Role of Perches in Limiting American Kestrel Uses on Hilltop Field Within the Kittatinny Raptor Migration Corridor Near Bake Oven Knob,Lehigh County, Pa. American Hawkwatcher, 18: 2-4.
Heintzelman, Donald S. 1994 Further Observations of Raptor Use and Habitat Alteration of Hawk Hill, Heidelberg Township, Lehigh County, Pa. American Hawkwatcher, 20: 5.
Heintzelman, Donald S. and Alexander C. Nagy 1968 Clutch Sizes, Hatchability Rates, and Sex Ratios of Sparrow Hawks in Eastern Pennsylvania. Wilson Bulletin, 80: 306-311.