March 25, 1911: The Triangle Shirtwaist Fire.
I loved Katharine Weber's writing, period—I'm not usually drawn to reading about science and math, but I found the segments about George's music (and about Rebecca's job as a genetics researcher) just as fascinating as the personal relationships and the history. The transcripts of Esther's interviews and testimony brought her to life for me. It was short (less than 250 pages), but it was tight, so tight that I felt much more strongly about these characters than I have about many in other, longer novels.
There are some YA titles about it, too (Ashes of Roses, Threads and Flames, and Uprising are the ones I've seen most often mentioned). I haven't read any of them, though: any standouts that I should bump up the list?