*[[public domain]] detective stories: the first three novels in ''The Hardy Boys'' series by Franklin W. Dixon (The Tower Treasure, The House on the Cliff, and The Secret of the Old Mill)<ref name="Public Domain">https://www.richlandsource.com/area_history/public-domain-makes-artistic-works-available-published-in-1927-before/article_300b067c-90b3-11ed-b1d0-2bbf0785a32e.html</ref> | *[[public domain]] detective stories: the first three novels in ''The Hardy Boys'' series by Franklin W. Dixon (The Tower Treasure, The House on the Cliff, and The Secret of the Old Mill)<ref name="Public Domain">https://www.richlandsource.com/area_history/public-domain-makes-artistic-works-available-published-in-1927-before/article_300b067c-90b3-11ed-b1d0-2bbf0785a32e.html</ref> |