The 1915 Bujutsu Sōsho (武術叢書) of Hirayama Kōzō (国書刊行会 編) is available from a NDL record published by 国書刊行会:
『武術叢書』 (Bujutsu Sōsho), the 1915 (Taishō 4) Kokusho Kankōkai collectanea of classic swordsmanship texts, edited by Hayakawa Junzaburō, 548 pages, NDL PID 1764781, and public-domain. It’s a landmark anthology, gathering some twenty Edo-period bujutsu treatises in one volume: Honchō Bugei Shōden, Gekiken Sōdan, the Gorin no Sho, Fudōchi, Taia-ki, Tengu Geijutsu-ron, Jōseishi Kendan, and more. Whose text that is: Hirayama Kōzō.
The author-note — surname Hirayama (平山), imina Sen/Hisomu (潜), azana Shiryū (子龍), gō Heigen (兵原) / Renbudō (練武堂) / Unchū Shinjin (運籌真人), common name Kōzō (行蔵), died of illness in the 12th month of Bunsei 10 (1827) aged 70 — is Hirayama Kōzō (平山行蔵, 1759–1828), the late-Edo military scientist and swordsman. “Unchū Shinjin” is his own gō, which is why the appended sword text is styled Unchū-ryū.
What passed through Yamada Jirōkichi’s collection into Bujutsu Sōsho was Hirayama Kōzō’s material.
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Yamada Jirōkichi as the editor’s own teacher. The colophon line — 「校訂を終るに臨みて我〔斯／剣〕道の師山田次郞吉先生の高誼を鳴謝す」 — reads roughly: “On completing the collation, I gratefully acknowledge the gracious support of my teacher in the [sword] Way, Master Yamada Jirōkichi.” 斯道 (“this discipline”) or 剣道. So Hayakawa Junzaburō, the compiler of Bujutsu Sōsho, was Yamada Jirōkichi’s student — which is why the whole anthology is steeped in Yamada’s material. It’s a pupil’s collation under the fifteenth head’s patronage.
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Yamada Jirōkichi as the manuscript source. 「山田次郞吉氏所藏の寫本による」 = “based on the manuscript held by Mr. Yamada Jirōkichi.” So specific texts were collated directly from his library — genuine provenance: those densho came down through the JSKR fifteenth head’s collection. This is connected via Honshiki San-mondō with its appended Unchū-ryū Kenjutsu Yōryō (本識三問答・附運籌流劒術要領, one volume) — “本書は山田次郞吉氏所[藏].”
