But the nagging question remained: Could an IBM Selectric Composer have been used to produce these documents?

I found my answer the same place everybody finds everything these days: Google. Typing "IBM Selectric Composer" into that search site took me to the aptly named ibmcomposer.org, which describes itself as "the only site on the Internet completely dedicated to the IBM 'Selectric' Composer line of typesetting machines." The site, which is run by Gerry Kaplan, includes information, scanned user manuals, and photographs of the only working IBM Selectric Composer I've been able to find. And, fortunately for me, it also includes an e-mail address.

When I first heard back from Gerry, I felt a little bad for having bothered him. He'd been fielding calls and letters all day, he told me, including an inquiry from CNN. But he was a trouper, willing — enthusiastic even — to help out.