https://planetofbirds.com/ring-billed-gull-article-10/
MIGRATION AND DISPERSAL IN GREAT LAKES RING-BILLED AND HERRING GULLS - Planet of Birds
Dec 27, 2011 - Ring-billed Gull (Larus delawarensis) Science Article 10 abstract Band-recovery dam for Ring-billed (Larus delawarensis) and Herring (L. argen- tatus) Gulls
migration and dispersal