Western Pennsylvania Conservancy

2006 [2021-04-06]. （原始内容存档于2021-03-24） （英语）.  The Western Pennsylvania Conservancy; The Nature Conservancy. Classification, Assessment and Protection ofForested

(Phaidon Press 2002) Lynda S. Waggoner and the 西部賓夕法尼亞州自然保護區（英语：Western Pennsylvania Conservancy）, Fallingwater: Frank Lloyd Wright's Romance With Nature (Universe

Proceedings of Washington Bald Eagle symposium. Seattle, WA: The Nature Conservancy. 1980: 105–115 （英语）.  Mabie, D. W.; Todd, M. T.; Reid, D. H. Dispersal

birds (PDF). Ontario Birds. 2020: 36–48.  Apricot Mallard. Chavez Park Conservancy.  van Grouw, Hein. Not every white bird is an albino: sense and nonsense

[2010-04-24]. （原始内容存档于2014-12-17）.  Presidents' Letter. The Education Conservancy. 2007-05-10 [2010-05-24]. （原始内容存档于2017-12-15）.  Shimer College Joins