Gengogaku daijiten = The Sanseido Encyclopedia of Linguistics
言語学大辞典　 6 vols.
EA Ref: P29 .K33 1988

Gendai gengogaku jiten = Seibido's Dictionary of Linguistics
現代言語学辞典
EA Ref: P29 .G39 1988

Gendai Nihongo Hōgen Daijiten = Dictionary of Japanese Dialects
現代日本語方言大辞典 9 vols.
EA Ref: PL191 .G46 1992
Arranged in a-i-u-e-o order.  Vol. 9 is an index.

Kokugogaku daijiten
国語学辞典
EA Ref. PL511 .K6 1980 

Kokugogaku kenkyū jiten
国語学研究事典
EA Ref: PL515 .K658 1977

Nihon hōgen daijiten
日本方言大辞典  3 vols.
EAC: PL691 .N54 1989
2 vols. plus index

Nihongo hyakka daijiten = An Encyclopedia of the Japanese Language
日本語百科大事典
EA Ref: PL523 .N425 1988  

Nihon gengo chizu
日本言語地図
EA Collection Oversize: G2356.E3 K6 1966

Kanji hyakka daijiten
漢字百科大辞典
EA Ref: PL528 .K36 1995