Beatrice Tonnesen (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Beatrice Tonnesen" in English language version.

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US Patent US1664436, April 13, 1928. Beatrice S. Tonnesen: Holder for Long Stem Flowers. Filed June 16, 1924. US Patent US 1547846, July 28, 1925. Beatrice Tonnesen: Portable Combination Sewing Table and Cabinet. Filed March 28, 1924.

Cross, Scott (Summer/Fall 2004). "Beatrice Tonnesen: Photography Pioneer". Voyageur Magazine.^{[permanent dead link]}