Hiraguchi, T., 1981, The Shinbo site, The History of Uchiura-machi,
1:291-341. (In Japanese)
Hiraguchi, T., 1990, Paleolithic 'spear-shape points' viewed from 'stone
spearheads' of the Jomon period, Memorial Theses of Ancient History
for the Late Professor Nobuo Ito, 51-66. (In Japanese)
A spearpoint of the ealy Middle Jomon-period, found
at the Shinbo site, Uchiura-machi, Ishikawa Prefecture.