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  1. The effect of age on habit formation in the albino rat ...
    By: Hubbert, Helen Brewster,
    Publication info: Baltimore, Md.,1915.
    Contributed by: The Johns Hopkins University Sheridan Libraries (archive.org)
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  2. The effect of age on habit formation in the albino rat / [by] Helen B. Hubbert. Pub. at Cambridge, Boston, Mass.
    By: Hubbert, Helen Brewster,
    Publication info: New York :H. Holt & company ;[etc., etc.] 1915.
    Contributed by: University of California Libraries (archive.org)
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