American Savings & Loan Assn. said it...

American Savings & Loan Assn. said it has signed an agreement with Gibraltar Savings to purchase three retail Gibraltar branches in La Jolla, La Mesa and San Juan Capistrano . . . Dynamed Inc. has acquired Los Angeles-based Health International, a health-care management firm, in exchange for 88%of Dynamed’s shares . . . Great Western Bank, a unit of Great Western Financial Corp. of Beverly Hills, said it purchased three retail banking branches in southern Florida from Guardian Savings & Loan Assn. for undisclosed terms. . . . Aetna Life & Casualty of Canada, a subsidiary of Aetna Life & Casualty Co., has reached an agreement in principle with Laurentian General Insurance Co. on the sale of Aetna Canada’s casualty-property subsidiary.