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Photographer; amateur conchologist; "Shell Album" (1953); general self-collected; fossils; Liguus; Trigonostoma helenae Olsson, 1964 and Morum obrienae Olsson & Petit, 1964 named in her honor - Edit
spouse Clarence O'Brien (photographer) general interest in shells - Edit
1954 J.Q. Burch' s Directory of Conchologists - Ft. Myers, FL 1956 J.Q. Burch' s Directory of Conchologists " worldwide marine & land shells; fossils marine life in general - Edit
1968 R.E. Petit's Directory of Conchologists 1970 R.E. Petit's International Directory of Conchologists 1972 R.E. Petit's International Directory of Conchologists worldwide marine shells; fossil mollusks - Edit
1974 The Shell Cabinet’s International Directory of Conchologists - Daytona Beach, FL 1976 The Shell Cabinet’s International Directory of Conchologists 1978-79 The Shell Cabinet’s International Directory of Conchologists " 1982-83 The Shell Cabinet’s International Directory of Conchologists " worldwide marine shells; fossil mollusks - Edit
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