Books by Sophia Yhlen-Olsen Bertelsen:
Books in the extended shelves:
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Bertelsen, Sophia Yhlen-Olsen, Fru: How to teach a foreign language (G. Allen and Unwin, 1923), also by Otto Jespersen (page images at HathiTrust; US access only)- Bertelsen, Sophia Yhlen-Olsen, Fru: How to teach a foreign language (G. Allen & Unwin, 1917), also by Otto Jespersen (page images at HathiTrust; US access only)
Find more by Sophia Yhlen-Olsen Bertelsen at your library, or elsewhere.