Nice find. I think these gulls look much similar to Ring-billed Gulls, Larus delawarensis . You can compare here: http://www.allaboutbirds.org/guide/ring-billed_gull/id
Laughing gulls have dark legs and bills (and black heads in when in breeding plumage) http://www.allaboutbirds.org/guide/Laughing_Gull/id
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