Go rokuroku shū
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後六々撰(ぎろくろくせん)
新編国歌大観V.270
A selection of good poems made by Fujiwara no Norikane 藤原範兼 in the 12th century. 146 poems from 36 authors, with each author having from 2 to 10 poems selected. The title "Later selection of 66" apparently indicates 6 x 6 = 36. The "later" is probably in reference to Fujiwara no Kinto's earlier Sanjuu rokunin sen (selection of 36 people).