Eclipse of Reason appeared under Horkheimer’s name alone despite being joint work.

Evidence

However, the book version of the lectures, published in 1947, on which Adorno had been the main collaborator alongside Lowenthal and Gurland, listed only Horkheimer as its author. But in the preface it was stated: These lectures were designed to present in epitome some aspects of a comprehensive philosophical theory developed by the writer during the last few years in association with Theodore [sic] W. Adorno. It would be difficult to say which of the ideas originated in his mind and which in my own; our philosophy is one. — Rolf Wiggershaus, The Frankfurt School, 369

Categorization

• XREF: Connects to the Dialectic of Enlightenment chapter’s account of Horkheimer and Adorno’s fused authorship; the ‘our philosophy is one’ line directly echoes it. — connects to: Eclipse of Reason was jointly authored with Adorno though published under Horkheimer alone — Rolf Wiggershaus, The Frankfurt School: Its History,…, 1452; Horkheimer’s named collaborations often consisted only of marginal notes and suggested edits. — Rolf Wiggershaus, The Frankfurt School: Its History,…, 494
• yield-rescued: below the book’s yield-target cutoff, included anyway for connecting to: Eclipse of Reason was jointly authored with Adorno though published under Horkheimer alone — Rolf Wiggershaus, The Frankfurt School: Its History,…, 1452; Horkheimer’s named collaborations often consisted only of marginal notes and suggested edits. — Rolf Wiggershaus, The Frankfurt School: Its History,…, 494

Broader Connections

• Eclipse of Reason was jointly authored with Adorno though published under Horkheimer alone #corroborates (0.96) — Rolf Wiggershaus, The Frankfurt School, 1452