Works identified
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E. McKnight Kauffer Actors Prefer Shell, You Can Be Sure of Shell 1933 -
E. McKnight Kauffer Magicians Prefer Shell 1934 -
E. McKnight Kauffer Ask For BP Not Just Ethyl 1933 -
E. McKnight Kauffer BP Ethyl Anti-Knock Controls Horse-Power 1933 -
E. McKnight Kauffer Magicians Prefer Shell, You Can Be Sure of Shell 1934