Final | time | | 1. Beth Whittall | CAN | 1:16.2 | PR | 2. Betty Mullen | USA | 1:16.5 | 3. Shelley Mann | USA | 1:17.7 | 4. Mary Jan Sears | USA | 1:18.2 | 5. Maria Cristina Amieba | MEX | 1:22.7 | 6. Linda Shier | CAN | 1:30.2 |
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Heat 1 | time | Rk. | 1. Beth Whittall | CAN | 1:16.9 | 2. Isabel Mann | USA | 1:17.8 | 3. Maria Cristina Amieba | MEX | 1:26.0 | 4. Sonia Aparecia | BRA | 1:31.3 | 5. Wanda Castro | BRA | 1:33.3 | 6. Adriana Hernandez | MEX | 1:40.2 |
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Heat 2 | time | Rk. | 1. Betty Mullen | USA | 1:16.3 | 2. Mary Jan Sears | USA | 1:17.2 | 3. Linda Shier | CAN | 1:29.3 | 4. Shirley Jones | CAN | 1:33.6 | 5. Ruby Bonder | CHI | 1:36.1 | 6. Irma Schluter | MEX | 1:36.4 |
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