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Books about Sohaku:
Sohaku jisshu (Japanese Edition) by Engyo Mitamura (Jan 1, 1916)
Wiki information Sohaku:
Kobori Nanrei Sōhaku was a Japanese Rinzai roshi and former abbot of Ryōkōin, a subtemple of Daitoku-ji in Kyoto, Japan. A student of the late Daisetz Teitaro Suzuki, Sōhaku was fluent in English and known to hold regular sesshins until the 1980s...