1967 · King's first professional sale (Startling Mystery Stories, 1967). Reprinted in Weird Tales (1990) and Cemetery Dance #68 (2012, available as Kindle ebook). Also in The Best of Cemetery Dance 2.
1970 · Published in 8 installments in The Maine Campus (UMaine, summer 1970). King has legally blocked reprinting. A few installments are archived on UMaine Digital Commons. Search for 'Slade' or summer 1970 issues.
1993 · Published in First Words: Earliest Writing from Favorite Contemporary Authors (1993). The anthology may be borrowable on Archive.org — search for 'First Words Mandelbaum'.
1993 · Originally in People, Places and Things (1960, self-published with Chris Chesley). Reprinted in The Market Guide for Young Writers 5th ed. (1993). Very short flash fiction. Not freely available online.
2003 · An edited excerpt from Wolves of the Calla. Published in McSweeney's Quarterly Concern #10 and McSweeney's Mammoth Treasury of Thrilling Tales (2003, ed. Michael Chabon). The anthology may be borrowable on archive.org.
2004 · An early excerpt/draft of Lisey's Story. Published in McSweeney's Enchanted Chamber of Astonishing Stories (2004, ed. Michael Chabon). Nominated for Bram Stoker Award. McSweeney's anthology may be borrowable on archive.org.
2006 · Originally in Tin House magazine (Summer 2006). Reprinted as annex to Blaze (2007) and in Detours (2014). Later became opening of Duma Key. Blaze is borrowable on Archive.org (free account required) at the linked URL.
2017 · Published in Ploughshares Vol 43 No. 2 (Summer 2017). Available to purchase/subscribe at Ploughshares. Project MUSE also has it (institutional access required). Not freely available online.