found: Conserving migratory songbirds in the Midwest, 1995:t.p. (Partners in Flight/Aves de las Americas, Midwest Working Group) p. 4 (Partners in Flight; program established by governmental agencies, private conservation organizations, academic institutions and individuals, to reverse the decline of migratory songbirds)
found: Dunn, E.H. Une comparaison des systèmes canadien et américain de Partenaires d'envol... , 1999 at http://www.cws-scf.ec.gc.ca/pub/list/pub/fmain.html.
found: http://www.partnersinFlight.org/(Compañeros en vuelo)
found: Its home page, Feb. 4, 2011(Partners in Flight (PIF))