Two readers of Liang Zhongtang's 2014 book — one directly, one as glossed by the first — identify its most substantively discussed content as the Ma Yinchu persecution chapters, not Song Jian's causal role

chinapopulation-policyone-child-policyhistoriographycontested-causationliang-zhongtangsong-jianma-yinchusourcing-scaffolding

A detailed critical Douban review of Liang Zhongtang's 2014 book, by a self-identified population-history researcher (handle 水草狗, who states they consulted the book for research), opens: "the most influential content of Liang's book is two chapters: 'The Full Story of the Ma Yinchu Incident' and 'An Investigation into Kang Sheng and Chen Boda's Criticism of Ma Yinchu'; these two chapters were also published separately as a standalone volume, An Investigation of Ma Yinchu." The review's roughly 2,000-word body — disputing whether Kang Sheng and Chen Boda personally orchestrated the 1959-60 political campaign against demographer Ma Yinchu — never mentions Song Jian. Separately, the same review glosses a critical response to the book from economist 张曙光 (Zhang Shuguang) of the Unirule Institute, delivered with Liang present, as centering on the same Ma Yinchu material ("我的观点与他基本 一致" — "my view is basically the same as his").

Neither reading is a systematic inventory of a 501-page book, and both are Tier 3-4 (an anonymous-handle review; a review's own paraphrase of a second critic's talk). Absence of mention is suggestive, not conclusive, that the Song Jian material is comparatively minor. [unverified-mechanism — needs primary]. Read together with claim-liang-2014-book-catalog-abstract-names-2009-essay-title-as-content, this narrows the likeliest shape of the unread book: three of four listed content areas concern Mao-era population politics and the Ma Yinchu dispute, with the Song Jian material folded into a fourth section closely tied to material the vault has already read.